Designed specifically for Small Block Chevy Hot 350 and 383 crate engines, the Borla CrateMuffler (MPN: 400820) is engineered to optimize the acoustics and flow of these specific engine families. Featuring the aggressive ATAK sound profile, this muffler is tuned to deliver a high-volume exhaust note while dramatically reducing or eliminating interior drone.

• Construction: Premium T-304 stainless steel for superior corrosion resistance and durability over 400-series alternatives
• Sound Series: ATAK (Aggressive Tongue-and-Cheek) sound level
• Configuration: 2.5-inch offset inlet / 2.5-inch center outlet
• Case Dimensions: 14-inch length x 4.35-inch height x 9-inch width (Oval)
• Directional Flow: Optimized internal design; outlet is identified by the mounting bracket welded to the endcap
• Manufacturing: Precision CNC-manufactured for an accurate fit
• Warranty: Manufacturer Million-Mile Warranty

The Borla CrateMuffler series provides a custom-tuned exhaust solution for high-performance crate engines, ensuring the sound matches the build quality of your Small Block Chevy.

The Borla Boomer Thumper is a high-performance universal muffler engineered for street and track applications where exhaust flow and sound control are paramount. Utilizing Borla's patented race-winning technology, this muffler is designed to reduce backpressure while delivering a signature aggressive exhaust note. This is a universal-fit component requiring professional installation and custom piping.

Constructed entirely from aircraft-grade T-304 austenitic stainless steel, the 40057 features 100% welded seams for maximum structural integrity under high heat. The internal core is packed with high-temperature continuous-filament fiber (CFF) acoustic material, ensuring long-term sound control without the blowout issues common in inferior glass-packed mufflers.

• Inlet Diameter: 2.25in (2-1/4")
• Tip Diameter: 4in Round fully polished integrated tip
• Body Shape: Oval Thumper series
• Material: T-304 Austenitic Stainless Steel
• Finish: Fully polished body and tip
• Construction: 100% welded for durability
• Internal Packing: High-temp continuous-filament fiber (CFF)
• Manufacturing: Made in the USA
• Warranty: Borla Million-Mile Warranty
• Manufacturer Part Number: 40057

This Borla Heavy Duty series universal muffler is specifically engineered for truck and SUV applications that require a long-body design for optimal sound attenuation. Constructed from premium T-304 austenitic stainless steel, this 100% welded muffler is built to resist corrosion and handle the thermal stress of high-mileage use.

• Inlet/Outlet: 3" center-inlet and 3" center-outlet configuration.
• Case Dimensions: 24" body length with a 6.75" round diameter.
• Installation: Features notched necks designed for secure clamp-on installation using 1" wide band style clamps (Borla 18330 or 18327, sold separately). For un-notched necks, see part 400436.
• Internal Design: Straight-through free-flow core maximizes exhaust velocity while high-temperature continuous-filament fiber (CFF) acoustic material provides precise sound control without restrictive baffles.
• Versatility: Fully reversible design allows for flexible installation orientations.

The natural mill finish can be brushed or polished to your preference before installation. This American-made muffler is backed by the Borla Million-Mile Warranty.

The Borla S-Type 400497 is a universal, high-performance muffler designed for custom exhaust builds where space is at a premium. Featuring a compact 5-inch round body and a 10-inch length, this muffler utilizes Borla's straight-through, free-flow design to maximize exhaust velocity while providing the aggressive S-Type sound profile. The reversible configuration allows for total installation flexibility in various chassis layouts.

• Material: Constructed from premium T-304 austenitic stainless steel for superior corrosion resistance and durability.
• Build: 100% welded construction with a natural mill finish that can be brushed or polished.
• Acoustics: Packed with high-temperature continuous-filament fiber (CFF) for consistent sound control and longevity.
• Installation: Features notched necks specifically designed for secure clamp-on installation using 1-inch wide band-style clamps (Borla 18325, sold separately).
• Specifications: 2.5-inch inlet and outlet diameters; 5-inch round case; 10-inch body length.

Handcrafted in the USA and backed by the Borla Million-Mile warranty, this muffler (MPN 400497) is built to outlast the vehicle. For a version with un-notched necks, see Borla part 40842S.

The Borla Pro-XS 400496 is a universal oval muffler designed for high-performance exhaust customization. This 2.5-inch center inlet/outlet muffler features notched necks, specifically engineered for secure and straightforward clamp-on installation. Its reversible design offers maximum flexibility for custom exhaust routing and tight packaging constraints.

• Manufactured from premium T-304 austenitic stainless steel for superior corrosion resistance and durability.
• 100% welded construction ensures structural integrity under high heat and vibration.
• High-flow straight-through design minimizes backpressure to improve exhaust scavenging and performance.
• Continuous-filament fiber (CFF) acoustic material provides long-lasting sound control without packing degradation.
• Natural mill finish allows for custom brushing or polishing to match your vehicle's aesthetic.
• Back-to-back testing shows increased flow over standard baffled mufflers.
• Backed by the Borla Million-Mile Warranty.

MPN: 400496

The Borla Pro-XS Universal Muffler (400495) is engineered for custom exhaust builds requiring a balance of maximum flow and precise sound attenuation. Built with an oval body and a free-flow internal design, this muffler minimizes backpressure to optimize engine efficiency. The notched neck design is specifically tailored for straightforward clamp-on installation, though it can also be welded for a permanent bond.

• Manufactured from T-304 austenitic stainless steel for superior corrosion resistance and longevity.
• 100% welded construction ensures structural integrity in high-vibration and high-heat environments.
• Reversible design provides maximum installation flexibility for various chassis configurations.
• Utilizes high-temperature continuous-filament fiber (CFF) acoustic material for consistent sound control without degradation.
• Natural mill finish allows for custom brushing or polishing prior to installation.

• Manufacturer Part Number: 400495
• Inlet/Outlet Diameter: 2.25in
• Inlet/Outlet Type: Notched (Clamp-on compatible)
• Body Shape: Oval
• Material: T-304 Stainless Steel
• Warranty: Borla Million-Mile Warranty

The Borla ProXS 400493 is a high-performance universal muffler engineered for custom exhaust systems requiring a dual inlet and dual outlet configuration. This 4" x 9.5" oval muffler features an integrated internal X-pipe, which synchronizes exhaust pulses to increase scavenging efficiency and provide a balanced, aggressive sound profile. Built from premium T-304 stainless steel, the 100% welded case is designed to withstand extreme temperatures and resist corrosion for the life of the vehicle.

• Material: High-quality T-304 stainless steel with a natural mill finish.
• Internal Design: Straight-through high-flow core with an internal X-pipe and high-temperature continuous-filament fiber (CFF) acoustic packing.
• Case Dimensions: 4" x 9.5" oval body, 19" case length, and 24" overall length.
• Inlet/Outlet: 2.5-inch dual inlet and 2.5-inch dual outlet.
• Installation: Reversible design for flexible mounting; includes notched necks for secure clamp-on fitment.
• Hardware Note: Requires 1-inch wide band-style clamps (Borla 18325) for installation; clamps sold separately.
• Warranty: Covered by the Borla Million-Mile warranty.

The Borla Pro-XS series universal muffler (MPN 400491) is engineered for custom exhaust builders seeking a balance of high-flow performance and durable construction. This oval-bodied muffler features a 3-inch offset inlet and outlet with notched necks, facilitating straightforward clamp-on installation or secure welding.

Constructed from premium T-304 austenitic stainless steel, the 400491 is built to resist corrosion and withstand high-heat environments. The internal free-flow design uses high-temperature continuous-filament fiber (CFF) acoustic material for precise sound control without compromising exhaust velocity. Its fully reversible design provides maximum flexibility for various chassis configurations.

• 3-inch offset inlet and outlet with notched necks for easy installation
• 100% welded T-304 stainless steel construction for maximum durability
• High-temperature CFF acoustic material for superior sound management
• Straight-through free-flow design to improve exhaust performance
• Natural mill finish suitable for brushing or polishing
• Reversible design for versatile mounting options
• Made in the USA and backed by a Million-Mile warranty

The Borla Pro-XS Universal Muffler (MPN 400490) is a performance-driven solution for custom exhaust fabrication, designed to deliver a deep tone without sacrificing flow. Built for longevity, this muffler is constructed from premium T-304 austenitic stainless steel to resist corrosion and is 100% welded for maximum structural integrity under high-heat conditions.

The straight-through, free-flow design minimizes backpressure while high-temperature continuous-filament fiber (CFF) acoustic material provides refined sound control. Featuring notched necks for secure clamp-on installation and a reversible internal configuration, this unit offers the flexibility needed for complex chassis routing. The natural mill finish can be easily brushed or polished to match your vehicle's aesthetic.

• Material: T-304 Stainless Steel
• Inlet/Outlet: 2.5" (Offset/Offset Notched)
• Body Shape: Oval
• Construction: 100% Welded
• Internal Packing: Continuous-Filament Fiber (CFF)
• Installation: Notched necks for clamp-on or weld-on fitment
• Warranty: Borla Million-Mile Warranty
• Part Number: 400490

The Borla Pro-XS Universal Muffler (400489) is engineered for custom exhaust fabrication, offering a high-flow solution with maximum durability. This oval-body muffler features 2.25-inch offset/offset notched necks designed for secure clamp-on installation and a reversible configuration to accommodate various mounting requirements. Constructed from premium T-304 austenitic stainless steel, this unit is built to resist corrosion and withstand high-heat environments.

• High-Quality Materials: T-304 austenitic stainless steel construction with 100% welded seams for superior structural integrity.
• Advanced Sound Dampening: High-temperature continuous-filament fiber (CFF) acoustic material provides consistent sound control without the blowout associated with lower-grade packings.
• Performance Engineering: A high-velocity free-flow internal design reduces backpressure while maintaining a refined exhaust note.
• Versatile Finish: The natural mill finish serves as a durable base that can be brushed or polished to a mirror shine prior to installation.
• Reliability: Manufactured in the USA and backed by the Borla Million-Mile warranty.

Specifications: 2.25" Inlet/Outlet, Offset/Offset configuration, Notched necks, Universal fitment.

The Borla PRO-XS 400487 universal muffler is engineered for high-performance custom exhaust applications requiring a single 3-inch center inlet and dual 2.5-inch outlets. Its reversible design offers maximum installation flexibility, allowing it to function effectively in both single-to-dual and dual-to-single configurations.

Constructed from premium T-304 austenitic stainless steel, this muffler is built for longevity and superior corrosion resistance. The 100% welded body houses a straight-through, free-flow internal design packed with high-temperature continuous-filament fiber (CFF) for precise acoustic control without restricting exhaust gas velocity. The notched necks simplify clamp-on installation for fabricators and DIYers alike.

• Manufacturer Part Number: 400487
• Inlet Configuration: 3.00in (Center)
• Outlet Configuration: 2.50in (Dual)
• Case Dimensions: 19in L x 4in H x 9.5in W
• Material: T-304 Stainless Steel with Natural Mill Finish
• Internal Construction: 100% Welded with CFF Acoustic Material
• Installation: Notched necks for clamp-on or weld-on fitment
• Warranty: Borla Million-Mile Warranty

Proudly manufactured in the USA, the PRO-XS series delivers the durability and tone expected from the industry leader in stainless steel exhaust systems.

This Borla PRO-XS series universal muffler (400485) provides a high-flow solution for custom exhaust systems requiring a single-to-dual or dual-to-single configuration. Engineered with a reversible design, it allows for maximum installation flexibility in various chassis layouts. The notched necks are specifically designed to facilitate secure clamp-on fitment, though the unit can also be welded for a permanent connection.

Constructed from high-quality T-304 austenitic stainless steel, this muffler is built to withstand corrosive environments and high-heat cycles. The internal free-flow architecture is packed with continuous-filament fiber (CFF) acoustic material, delivering a deep, controlled exhaust note without the drone or restriction of baffled designs. The 100% welded construction ensures structural integrity even under performance driving conditions.

• Inlet/Outlet: 2.5" Single Center / 2.5" Dual
• Case Dimensions: 19" L x 4" H x 9.5" W
• Material: T-304 Stainless Steel
• Finish: Natural Mill Finish (brushable or polishable)
• Internal: Continuous-filament fiber (CFF) sound absorption
• Configuration: Reversible notched neck
• Manufacturer Part Number: 400485
• Warranty: Million-Mile Warranty

The Borla PRO-XS universal muffler (400482) is a high-performance solution for custom exhaust systems, designed to maximize exhaust flow while maintaining superior sound control. This reversible center/offset oval muffler features 3-inch notched necks, providing the versatility for either clamp-on or weld-in installation in tight under-car clearances.

Built for longevity in harsh environments, this muffler is constructed from 100% welded T-304 austenitic stainless steel to prevent corrosion and rust. Internally, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material, which manages drone and resonance without the flow restrictions found in chambered designs. The natural mill finish provides a clean look out of the box and can be brushed or polished to a mirror finish before installation.

• Part Type: Universal Muffler
• Series: PRO-XS
• Inlet/Outlet: 3.0in Center / 3.0in Offset (Reversible)
• Case Dimensions: 14in L x 4in H x 9.5in W
• Material: T-304 Stainless Steel
• Finish: Natural Mill
• Internal Construction: Free-Flow Straight-Through with CFF Packing
• Warranty: Borla Million-Mile Warranty
• MPN: 400482

The Borla PRO-XS 400481 is a high-performance universal muffler engineered for custom exhaust systems where space is limited. This compact center/offset oval unit features a straight-through, free-flow design to minimize backpressure and maximize exhaust scavenging. Built from premium T-304 austenitic stainless steel, it provides superior corrosion resistance for long-term durability. The internal acoustic tuning utilizes high-temperature continuous-filament fiber (CFF), ensuring consistent sound control without the packing degradation common in lesser mufflers.

Its 100% welded construction provides the structural integrity needed for high-vibration environments, while the reversible design allows for flexible installation. The muffler features notched necks to accommodate easy clamp-on fitment or traditional welding. The natural mill finish offers a professional look out of the box and can be brushed or polished to a mirror finish for show-quality applications.

• Series: PRO-XS
• Configuration: Center/Offset Oval (Reversible)
• Inlet/Outlet Diameter: 2.5in
• Case Dimensions: 14in x 4.25in x 1.88in
• Material: T-304 Austenitic Stainless Steel
• Construction: 100% Welded with notched necks
• Acoustic Material: High-temperature Continuous-Filament Fiber (CFF)
• Manufacturer Part Number: 400481

The Borla PRO-XS universal muffler is engineered for high-performance custom exhaust builds, combining a free-flow internal design with durable T-304 austenitic stainless steel. This 100% welded oval muffler features a reversible center/offset configuration for maximum installation flexibility in tight spaces.

Built to withstand extreme heat, the PRO-XS utilizes high-temperature continuous-filament fiber (CFF) acoustic material for precise sound control without restricting exhaust gas velocity. The notched necks allow for a secure clamp-on installation, while the natural mill finish can be brushed or polished to suit your vehicle's aesthetic. This unit is manufactured in the USA and backed by a Million-Mile warranty.

• Part Number: 400480
• Case Dimensions: 14in x 4in x 9.5in
• Configuration: Center Inlet / Offset Outlet (Reversible)
• Material: T-304 Austenitic Stainless Steel
• Construction: 100% Welded with Notched Necks
• Acoustic Packing: Continuous-Filament Fiber (CFF)
• Inlet/Outlet Style: Notched for clamp-on installation
• Warranty: Million-Mile Warranty

The Borla PRO-XS 400478 is a high-performance universal muffler designed for custom exhaust fabrication. This oval-bodied muffler features a reversible center/offset configuration, providing maximum installation flexibility for various chassis layouts. Engineered with a straight-through, free-flow internal design, it reduces backpressure to improve exhaust scavenging and engine efficiency.

• Configuration: 2.25in center/offset notched necks for secure clamp-on or weld-on installation
• Case Dimensions: 14in length x 4in height x 9.5in width
• Construction: 100% welded T-304 austenitic stainless steel for superior corrosion resistance and durability
• Acoustic Tuning: High-temperature continuous-filament fiber (CFF) packing for consistent sound control
• Finish: Natural mill finish (suitable for brushing or polishing)
• Origin: Manufactured in the USA and backed by Borla's Million-Mile warranty

The PRO-XS series is the ideal choice for enthusiasts seeking a refined performance tone without the drone associated with lower-grade materials. The notched neck design specifically eases the fitment process when using traditional exhaust clamps.

The Borla PRO-XS universal muffler (400477) is engineered for performance applications where space is at a premium. Featuring a free-flow internal design, this oval-body muffler minimizes backpressure to improve exhaust velocity and engine efficiency. Its reversible configuration allows for installation flexibility, accommodating either center-in/offset-out or offset-in/center-out plumbing requirements.

Built to withstand high-heat environments and resist corrosion, the muffler is manufactured from 100% welded T-304 austenitic stainless steel. The notched inlet and outlet necks are designed for a secure, easy clamp-on installation. For sound management, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material to deliver consistent tonal control without the packing degradation common in lesser mufflers.

• Inlet/Outlet Diameter: 2.00in
• Configuration: Center/Offset (Reversible)
• Case Dimensions: 14in L x 4.25in H x 7.88in W
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Can be brushed or polished)
• Construction: 100% Welded
• Manufacturer Part Number: 400477

The Borla Turbo XL series 400436 is a universal, high-volume muffler specifically engineered for truck and SUV applications requiring a longer case for optimal sound attenuation. Constructed from premium T-304 austenitic stainless steel, this 24-inch muffler features a 100% welded assembly for maximum structural integrity and lifetime corrosion resistance.

This reversible, free-flow design utilizes high-temperature continuous-filament fiber (CFF) acoustic material to manage exhaust notes effectively without restricting flow. The 3-inch un-notched necks are designed for professional weld-on installation. The natural mill finish provides a clean look out of the box and can be brushed or polished prior to installation if a show-quality finish is desired.

• Inlet/Outlet: 3.00" Diameter
• Case Shape: 6.75" Round
• Case Length: 24.00"
• Material: T-304 Stainless Steel
• Inlet/Outlet Configuration: Center/Center (Reversible)
• Neck Style: Un-notched (Weld-on)
• MPN: 400436
• Warranty: Borla Million-Mile Warranty
• Manufacturing: Made in the USA

The Borla XR-1 Multi-Core Racing Muffler (400373) is engineered for high-horsepower builds and specifically optimized for rotary engine applications. Featuring Borla's patented 4-tube Multi-Core internal design, this muffler provides exhaust flow that actually exceeds a straight pipe of the same diameter, ensuring maximum horsepower and torque gains without the flow restrictions of traditional baffles.

Constructed from 100% welded T-304 stainless steel with a natural mill finish, the XR-1 is built to withstand extreme track conditions. High-temperature continuous-filament fiber (CFF) acoustic material provides long-lasting sound control and thermal stability. Its reversible, center-to-center configuration allows for versatile installation across a wide range of platforms, from racing sedans to high-output trucks and SUVs.

• Series: XR-1 Multi-Core Racing
• Inlet/Outlet: 3.00" Center / 3.00" Center
• Body Dimensions: 6.25" Round x 16" Length
• Overall Length: 21"
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Brushable or Polishable)
• Internal Design: Patented 4-Tube Multi-Core
• Acoustic Packing: Continuous-Filament Fiber (CFF)
• Configuration: Reversible, No Logo Embossment
• MPN: 400373
• Made in the USA

The Borla XR-1 Multi-Core racing muffler (MPN 400372) is a universal exhaust component engineered for high-horsepower applications and specifically optimized for the high exhaust gas temperatures of rotary engines. Unlike traditional baffled mufflers, this unit features Borla's patented Multi-Core 4-tube internal design, which is lab-proven to flow more air than a standard straight pipe, providing maximum horsepower and torque gains for competition use.

Built from heavy-duty T-304 stainless steel with a 100% welded chassis, this muffler is designed to resist corrosion and survive the rigors of track use. The compact 12-inch oval body is ideal for custom builds with limited underbody clearance. Sound control is handled by high-temperature continuous-filament fiber (CRF) acoustic material, delivering a deep, aggressive tone without restricting exhaust velocity.

• Inlet/Outlet: 3.00 in. Center / 3.00 in. Center
• Body Dimensions: 4.25 in. x 7.88 in. Oval; 12 in. Body Length
• Overall Length: 17 in.
• Material: T-304 Stainless Steel
• Finish: Natural Mill (No embossed logo)
• Internal Construction: Patented 4-Tube Multi-Core
• Installation: Fully reversible design
• Manufacturer Part Number: 400372

The Borla ProXS Turbo XL Muffler (MPN 400287) is a high-performance universal solution designed for dual-exhaust systems. This muffler features an integrated internal X-pipe that equalizes exhaust pulses to enhance scavenging and provide a more refined, aggressive tone. Its reversible design allows for flexible mounting during custom fabrication.

Built for longevity and maximum flow, the assembly is constructed from 100% welded T-304 stainless steel to prevent rust and corrosion. The internal core is packed with high-temperature continuous-filament fiber (CFF) for consistent sound attenuation without the restriction of traditional baffled mufflers. The un-notched necks are specifically designed for weld-in installation on 2.25-inch piping.

• Inlet/Outlet: 2.25" Dual Inlet / 2.25" Dual Outlet
• Case Dimensions: 4" x 9.5" Oval; 19" Body Length
• Overall Length: 24"
• Material: T-304 Stainless Steel with natural mill finish
• Internal Design: Free-flow with integrated X-pipe
• Installation: Un-notched necks (weld-on); compatible with 3" wide band clamps
• Manufacturing: Made in the USA
• Warranty: Borla Million-Mile Warranty
• Part Number: 400287

This universal-fit Borla PRO-XS muffler (MPN 400286) is engineered for high-performance applications requiring a dual 2.50-inch inlet and outlet configuration. It features an integrated internal X-pipe designed to balance exhaust pulses, improving both scavenging efficiency and sound quality compared to traditional dual-inlet mufflers. Built from premium T-304 stainless steel, the 100% welded case offers superior corrosion resistance and long-term structural integrity.

The muffler utilizes a straight-through, free-flow design packed with high-temperature continuous-filament fiber (CFF) for precise acoustic control without restricting power. The un-notched necks are designed specifically for weld-in installation; if clamping is preferred, 3-inch wide band clamps (Borla PN 18004) are required. The reversible case design allows for maximum installation flexibility in tight chassis environments.

• Dual 2.50" Inlet / Dual 2.50" Outlet
• 4" x 9.5" Oval Body, 19" Length (24" Overall Length)
• Internal X-Pipe design for balanced flow and enhanced tone
• T-304 stainless steel construction with a natural mill finish
• High-temperature continuous-filament fiber (CFF) acoustic material
• Un-notched necks for professional weld-in installation
• Backed by Borla's Million-Mile Warranty
• Manufacturer Part Number: 400286

The Borla XR-1 Multi-Core Racing Muffler (400115) is a high-volume, universal exhaust solution engineered for high-horsepower applications where flow is critical. While originally designed for Pre-Runner trucks, the long 34-inch case design makes it an ideal choice for SUVs, full-sized trucks, and high-heat applications like rotary-equipped vehicles. This muffler features Borla's patented 4-tube Multi-Core internal design, which is laboratory-proven to flow better than a straight piece of tubing, maximizing horsepower and torque gains.

• Internal Technology: Patented Multi-Core 4-tube design optimizes exhaust gas velocity and flow.
• Durability: Constructed from premium T-304 stainless steel with reinforcing ribs on the body and 100% welded seams for off-road structural integrity.
• Sound Control: Packed with high-temperature T-304 stainless steel wool to maintain a race-ready tone without degrading over time.
• Installation: Reversible design for mounting flexibility; natural mill finish can be brushed or polished.
• Specifications: 3-inch center inlet and outlet, 5.5-inch x 8.5-inch oval body, 34-inch body length, and 39.25-inch overall length.

This part (MPN 400115) does not feature a Borla logo embossment, providing a clean, stealth appearance for custom fabrications.

The Borla XR-1 Sportsman Shorty racing muffler is a high-performance, universal-fit exhaust component engineered for track and racing applications where space is at a premium. Built from premium austenitic stainless steel, this muffler utilizes Borla’s patented XR-1 Raceline flow-through technology to provide maximum exhaust gas velocity and horsepower gains without the restrictive baffles found in street mufflers.

This compact unit features a reversible design, allowing for versatile mounting in custom exhaust systems. The un-notched necks are specifically designed for professional weld-in installation, ensuring a leak-free, high-strength connection. With no logo embossment on the muffler body, it offers a clean, understated appearance for door cars and roadsters.

• Inlet/Outlet Diameter: 3.5 in
• Configuration: Center Inlet / Center Outlet
• Body Shape: 5 in Round
• Body Length: 8 in
• Overall Length: 13 in
• Material: Austenitic Stainless Steel
• Design: Reversible Flow-Through
• Installation: Weld-On (Un-notched necks)
• Manufacturer Part Number: 40004S

The Borla XR-1 Multi-Core Racing Muffler (MPN 400024) is engineered for high-horsepower racing and street applications where maximum exhaust flow is critical. Featuring Borla's patented 6-tube multi-core design, this muffler is tested to flow more efficiently than a straight section of tubing, helping to maximize horsepower and torque output.

Built for durability in extreme environments, the muffler is constructed from 100% welded T-304 stainless steel to prevent corrosion. The internal high-temperature continuous-filament fiber (CRF) acoustic material ensures consistent sound control over the life of the part. This universal, reversible design is suitable for a wide range of vehicles, including high-output trucks, SUVs, and rotary engines.

• Inlet/Outlet Diameter: 2.5" Center / 2.5" Center
• Body Dimensions: 6.25" Round x 14" Long
• Overall Length: 18.5"
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Can be brushed or polished)
• Internal Design: Patented Multi-Core 6-tube technology
• Installation: Universal fitment; reversible design
• Manufacturer Part Number: 400024
• Origin: Made in the USA

This Borla universal exhaust tip provides a professional, custom finish for 3-inch exhaust systems. Built from premium T-304 austenitic stainless steel, it offers exceptional corrosion resistance and a mirror-polished shine designed to maintain its appearance through years of high-heat cycles and road exposure.

The 4.25-inch round outlet features a rolled angle-cut design, providing a clean, aggressive look that complements a wide range of rear bumper profiles. Each tip is precision-welded for structural integrity and is backed by Borla's Million-Mile warranty.

• Manufacturer Part Number: 20251
• Inlet Size: 3.00 inches
• Outlet Size: 4.25 inches
• Overall Length: 4.00 inches
• Shape: Round
• Edge Style: Rolled Angle-Cut
• Material: T-304 Stainless Steel
• Finish: Mirror-Polished

Enhance your vehicle's exhaust profile with the Borla 5-inch round exhaust tip. This premium component is manufactured from T-304 austenitic stainless steel, providing superior resistance to heat and corrosion compared to lower-grade materials. The mirror-polished Bright Chrome finish and precision welds ensure a high-end look that maintains its luster over time.

Designed for straightforward installation, this 14-inch long tip features a rolled angle cut for a classic performance aesthetic. It is engineered to secure directly to 4-inch exhaust piping using the included heavy-duty clamp. Like all Borla premium tips, it is backed by the manufacturer's Million-Mile warranty, reflecting its long-term durability and construction quality.

• Manufacturer Part Number: 20249
• Inlet Diameter: 4.0 inches
• Outlet Diameter: 5.0 inches
• Length: 14.0 inches
• Material: T-304 Stainless Steel
• Finish: Bright Chrome (Mirror-Polished)
• Tip Shape: Round
• Cut Style: Rolled Angle Cut
• Mounting Style: Clamp-on

Finish your exhaust system with the Borla 20248 resonated exhaust tip, engineered to provide a refined aesthetic and subtle sound tuning. Unlike standard tips, this resonated version features an internal core designed to dampen specific exhaust frequencies for a smoother tone. Every tip is manufactured from high-quality T-304 austenitic stainless steel to ensure maximum resistance against corrosion and heat discoloration.

• Manufacturer Part Number: 20248
• Inlet Diameter: 2.25in
• Outlet Diameter: 4in Round
• Cut Style: Rolled Angle Cut
• Configuration: Resonated
• Total Length: 13in
• Material: Mirror-Polished T-304 Stainless Steel
• Construction: Precision-welded for long-term durability
• Warranty: Borla Million-Mile Warranty

Upgrade your vehicle's rear aesthetics with the Borla Phantom X Series universal exhaust tip. This premium component is engineered for durability and style, featuring a 2.5-inch inlet and a substantial 4.5-inch round outlet with a rolled angle-cut profile. Constructed from high-quality T-304 austenitic stainless steel, it provides superior resistance to corrosion and heat discoloration compared to standard 400-series steel.

• Series: Phantom X
• Inlet Diameter: 2.5 inches (Inside Diameter)
• Outlet Diameter: 4.5 inches (Round)
• Overall Length: 7.75 inches
• Material: T-304 Stainless Steel with mirror-polished finish
• Design: Rolled angle cut with embossed Borla logo
• Installation: Universal fitment for custom exhaust configurations
• Part Number: 20247

Each tip features precision welds and is backed by the manufacturer's Million-Mile warranty, ensuring long-term performance and finish retention for the life of your vehicle.

Finish your exhaust system with the Borla 20246 universal exhaust tip, designed for enthusiasts who require a show-quality appearance and long-term durability. This tip is manufactured from premium T-304 austenitic stainless steel, a non-magnetic material that offers superior resistance to corrosion and pitting compared to 400-series stainless or aluminized steel.

• Manufacturer Part Number: 20246
• Material: T-304 Austenitic Stainless Steel
• Finish: Mirror-Polished Bright Chrome
• Construction: Precision-welded for structural integrity
• Warranty: Borla Million-Mile Warranty

The 20246 features precision-welded construction and a mirror-polished bright chrome finish that provides a distinctive, custom look. Because it is built from high-grade T-304 stainless, it maintains its luster even under high heat and harsh road conditions. This universal tip is an ideal solution for custom exhaust builds or replacing worn factory outlets.