The Stainless Bros 3in x 12.0in OAL Lightweight Muffler is a premium choice for automotive fabricators looking to manage exhaust acoustics without adding excessive weight to a build. This compact, straight-through design is ideal for performance applications where space is at a premium and high flow is a necessity. The professional matte finish provides a clean, understated look that complements high-end custom exhaust systems.

• Manufacturer Part Number: 615-07613-0000
• Overall Length (OAL): 12.0 inches
• Main Body Diameter: 3.0 inches
• Finish: Matte
• Construction: Lightweight stainless steel design for performance fabrication

Whether you are building a track-ready setup or a high-performance street car, this muffler provides the durability and flow characteristics required for modern high-output engines.

Refine your vehicle's exhaust note with the Stainless Bros 12.0-inch Bullet Resonator. Designed for custom exhaust fabrication, this resonator features a 3.5-inch round body that effectively reduces rasp and cabin drone without restricting exhaust flow. The compact bullet-style housing makes it an ideal solution for tight clearances under the chassis.

• Inlet/Outlet Diameter: 2.50 inches
• Body Diameter: 3.5 inches
• Overall Length: 12.0 inches
• Body Style: Round Bullet
• Reduces exhaust rasp and drone
• Manufacturer Part Number: 615-06336-0113

Engineered for high-performance exhaust fabrication, the Stainless Bros 304 Stainless Steel Flex Joint is designed to absorb engine vibrations and accommodate thermal expansion within your exhaust system. This prevents fatigue-induced cracking in manifolds, downpipes, and mounting points. The 3.5-inch inner diameter is ideal for high-flow custom exhaust builds where durability and thermal management are critical.

This component features a high-flow interlock liner. Unlike standard mesh liners, the interlock design creates a smooth internal surface that protects the bellows from high-velocity exhaust gases, reducing turbulence and preventing the internal whistling often found in lesser components. Constructed from 304SS, it offers excellent corrosion resistance and weldability for long-term service in harsh under-car environments.

• Manufacturer Part Number: 612-08906-1000
• Material: 304 Stainless Steel
• Inner Diameter: 3.5"
• Overall Length (OAL): 6"
• Liner Design: Smooth-bore Interlock Liner
• Construction: Multi-layer bellows with protective outer braid

Fabricate a more durable and efficient exhaust system with the Stainless Bros 304 Stainless Steel Flex Joint. Measuring 2.50 inches in diameter with a 6-inch overall length (OAL), this component is engineered to absorb engine vibrations and accommodate thermal expansion, preventing stress fractures in your exhaust tubing and manifolds.

This flex joint features an internal interlock liner, which provides a smooth path for high-velocity exhaust gases. Unlike standard braided liners, the interlock design protects the internal bellows from extreme heat and turbulence while preventing the common whistling or buzzing noises associated with high-performance setups. Constructed entirely from 304 stainless steel, it offers excellent corrosion resistance and weldability for custom fabrication projects.

• Manufacturer Part Number: 612-06304-1000
• Inlet/Outlet Diameter: 2.50 inches
• Overall Length (OAL): 6 inches
• Material: 304 Stainless Steel
• Internal Construction: Interlock Liner for improved flow and durability

Fabricate custom, high-clearance exhaust or intake plumbing with precision using this 5-pack of Stainless Bros pie cuts. Designed for professional fabricators, these 16-gauge segments allow for the creation of complex, tight-radius bends in cramped engine bays where standard mandrel-bent tubing cannot fit.

Each segment is engineered to maintain a consistent 5.0-inch diameter and a 1D (5.0-inch) centerline radius (CLR), ensuring smooth internal flow and structural integrity throughout the weldment. These pre-cut pieces significantly reduce preparation time for custom headers, downpipes, and intake tracks.

• Manufacturer: Stainless Bros
• Part Number: 609-12701-0016
• Outside Diameter: 5.0in
• Radius: 1D (5.0in CLR)
• Material Thickness: 16 Gauge
• Quantity: 5 Pie cuts per pack

Simplify complex exhaust and intake fabrication with this 5-pack of Stainless Bros 4.0in 16 Gauge Stainless Steel Pie Cuts. Engineered for high-clearance applications, these pie cuts feature a 1D (4.0 inch) Center Line Radius (CLR), allowing for aggressive bends in restricted engine bays or chassis tunnels where traditional mandrel bends may not fit.

Each component is precision-cut from high-quality 16 gauge stainless steel, ensuring consistent wall thickness and a clean surface finish that is ready for TIG welding. These pie cuts provide fabricators the flexibility to create custom angles and snake-like paths without the need for expensive tube bending equipment.

• Outer Diameter: 4.0 inch
• Wall Thickness: 16 Gauge
• Center Line Radius (CLR): 4.0 inch (1D)
• Material: Stainless Steel
• Quantity: 5 pieces per pack
• Manufacturer Part Number: 609-10201-0016

Fabricate professional-grade custom exhaust systems, intake tracts, or cooling lines with this 5-pack of Stainless Bros pie cuts. These segments are engineered for precision fabrication where off-the-shelf mandrel bends cannot meet specific packaging requirements. Each segment is manufactured from high-quality 16 gauge stainless steel, providing the wall thickness and durability required for high-heat automotive applications.

• Part Number: 609-10201-0006
• Diameter: 4.0 inches
• Material: 16 Gauge Stainless Steel
• Bend Radius: 1.5D (6.0" Center Line Radius)
• Radius Type: Loose Radius
• Quantity: 5 individual pie cuts per pack

Each piece is precision-cut to ensure consistent fitment and clean weld seams, making them ideal for TIG welding. Using pie cuts allows the builder to navigate complex engine bays or chassis constraints with custom-angled bends that maintain a consistent internal diameter for optimal flow.

Streamline your custom fabrication projects with this 6-pack of Stainless Bros 3-inch 16-gauge pie cuts. These precision-cut sections are designed for building high-performance exhaust systems, intake tracts, and coolant plumbing where space is at a premium. Featuring a tight 1D (1 x Diameter) Center Line Radius of 3 inches, these cuts allow for aggressive bends and complex routing that standard mandrel bends cannot achieve.

• Diameter: 3.00 inches
• Wall Thickness: 16 Gauge (0.065")
• Center Line Radius (CLR): 3.00 inches (1D)
• Material: High-quality Stainless Steel
• Quantity: 6-Piece Pack
• Manufacturer Part Number: 609-07602-0016

Each section is ready for TIG welding right out of the box, ensuring clean fitment and professional results for fabricators working in tight engine bays or chassis tunnels. These pie cuts provide the consistency needed for high-flow exhaust pathing and structural integrity.

Stainless Bros loose radius pie cuts are engineered for fabricators who demand precision and consistency when building custom exhaust systems, headers, or intake paths. These 3-inch pie cuts feature a 1.5D (4.5-inch) center line radius, providing a gradual "loose" bend that is ideal for managing flow and clearance in complex layouts.

Each piece is manufactured from 16-gauge stainless steel, ensuring a wall thickness that is durable yet easy to TIG weld. These pre-cut sections eliminate the time-consuming process of manually measuring and cutting straight tubing, allowing for faster assembly of complex multi-bend sections with professional-grade results.

• Brand: Stainless Bros
• Outside Diameter: 3.0"
• Wall Thickness: 16 Gauge (0.065")
• Center Line Radius (CLR): 4.5" (1.5D)
• Quantity: 5-Pack
• Part Number: 609-07601-0006

Fabricate professional-grade exhaust and intake systems in tight engine bays with Stainless Bros 2.50-inch 1D tight radius pie cuts. These 16-gauge segments are precision-cut to allow for complex, mandrel-style bends in spaces where a standard radius won't fit. Designed for high-performance fabrication, they provide consistent wall thickness and clean edges for high-quality TIG welding.

• Manufacturer Part Number: 609-06301-0016
• Diameter: 2.50"
• Center Line Radius (CLR): 2.50" (1D)
• Wall Thickness: 16 Gauge
• Quantity: 5-Pack
• Application: Ideal for custom headers, downpipes, and tight-clearance exhaust plumbing

Each 5-pack provides enough segments to handle significant directional changes while maintaining smooth internal airflow. These cuts eliminate the need for expensive mandrel bending equipment for one-off custom projects.

Stainless Bros 1D tight radius pie cuts are engineered for high-performance fabrication where standard mandrel bends lack the necessary clearance. These 1.75-inch diameter segments allow fabricators to create complex, multi-angle exhaust headers, intake pipes, and downpipes with professional precision. By using pre-cut segments, you ensure consistent wall thickness and a uniform internal flow path across tight turns.

• Outside Diameter: 1.75 inches
• Wall Thickness: 16 Gauge
• Bend Radius: 1D (1.75-inch Center Line Radius)
• Material: Stainless Steel construction for corrosion resistance
• Configuration: Tight radius segments for compact routing
• Quantity: 5-Pack
• Manufacturer Part Number: 609-04501-0016

Each piece is precision-cut to provide clean edges for superior TIG welding results. These are essential for custom builders working in tight engine bays or chassis tunnels where every millimeter counts.

The Stainless Bros Spring Tab Kit provides a reliable, high-performance solution for securing exhaust slip-joints, collectors, and modular piping sections. Constructed from high-grade SS304 stainless steel, these tabs and springs offer excellent corrosion resistance and durability under high thermal loads. This 5-pack kit is designed for fabricators who require a secure, vibration-resistant connection that allows for thermal expansion and easy disassembly.

• Material: SS304 Stainless Steel construction for maximum longevity
• Springs: 5 high-tension stainless steel springs included
• Hooks: 10 weld-on stainless steel hooks for secure anchoring
• Protection: 5 black silicone sleeves to dampen vibration and protect against heat soak
• Manufacturer Part Number: 608-00215-1101

The Stainless Bros Slip Joint Hook & Tension Spring kit provides a reliable, professional-grade solution for securing slip-fit exhaust connections. Engineered for custom exhaust fabrication, this hardware allows for essential thermal expansion and vibration dampening while preventing joint separation under high-load conditions.

• Manufactured from high-grade stainless steel for superior corrosion resistance and durability in high-heat environments.
• Designed to secure headers, collectors, and modular exhaust sections without the need for permanent welding or heavy clamps.
• Allows for easy disassembly of exhaust components for maintenance or tuning.
• Complete 2-pack kit includes (2) weld-on hooks and (2) heavy-duty tension springs.
• Manufacturer Part Number: 608-00212-1101

The Stainless Bros 4-inch to 5-inch transition reducer cone provides a professional-grade solution for connecting disparate tubing sizes in custom exhaust, intake, or turbocharger systems. This component is engineered for fabricators who need a clean, smooth transition within a compact 1-3/16-inch overall length (OAL).

• Material: 304 Stainless Steel for excellent corrosion resistance and weldability
• Small End Diameter: 4 inches
• Large End Diameter: 5 inches
• Overall Length (OAL): 1-3/16 inches
• Manufacturer Part Number: 607-12702-0000

This 304SS reducer is ideal for tight-clearance applications where a gradual taper is required to maintain flow velocity without adding excessive length to the assembly. Its durable construction ensures long-term reliability in high-heat automotive environments.

This Stainless Bros transition reducer cone (MPN 607-10289-0000) is engineered for custom fabrication where space is limited and a smooth transition between tubing sizes is required. Manufactured from high-grade 304 stainless steel, this cone allows you to bridge the gap between 3.5-inch and 4-inch outer diameter (OD) components while maintaining excellent corrosion resistance and weldability.

• Material: 304 Stainless Steel
• Inlet/Outlet: 3.5in OD to 4in OD
• Overall Length (OAL): 1-3/16in
• Construction: Precision formed for consistent wall thickness and fitment
• Part Number: 607-10289-0000

Ideal for exhaust systems, intake piping, and custom forced induction setups, this short-radius reducer provides a professional finish for tight-clearance plumbing projects.

This Stainless Bros transition reducer cone is a precision-engineered component for high-performance exhaust, intake, and intercooler piping fabrication. Built from 304 stainless steel, it provides excellent corrosion resistance and long-term durability in high-heat environments.

The cone features a smooth, concentric taper designed to maintain optimal flow velocity and minimize turbulence when transitioning between 3-inch and 4-inch outer diameter (OD) tubing. Its compact 2-3/8 inch overall length makes it ideal for custom builds where space is limited, such as turbocharger downpipes or tight intake routing.

• Material: 304 Stainless Steel (304SS)
• Small End Diameter: 3in OD
• Large End Diameter: 4in OD
• Overall Length (OAL): 2-3/8in
• Manufacturer Part Number: 607-10276-0000

Fabricated for high-performance applications, this Stainless Bros 304 Stainless Steel Transition Reducer Cone provides a precise solution for changing tubing diameters in custom exhaust or intake systems. This concentric reducer is engineered for durability and ease of welding in tight spaces where packaging is a priority.

• Material: 304 Stainless Steel (304SS) for excellent heat and corrosion resistance
• Transition Range: 3-inch to 3.5-inch outside diameter
• Overall Length (OAL): 1-3/16 inches
• Design: Precision-formed concentric transition for smooth flow
• Manufacturer Part Number: 607-08976-0000

This component is essential for professional fabricators requiring a reliable, high-strength transition between different piping sizes while maintaining the structural integrity of the assembly.

The Stainless Bros 304 stainless steel transition reducer cone provides a precision-engineered solution for changing tubing diameters in custom exhaust, intake, or intercooler plumbing. Fabricated from high-grade 304SS, this cone offers excellent corrosion resistance and durability for high-heat automotive applications.

With a compact overall length (OAL) of just 1-3/16 inches, this reducer is specifically designed for tight packaging environments where standard, longer transitions cannot be used. This component allows for a clean TIG weld between 2.50-inch and 3.00-inch OD tubing, facilitating a smooth flow transition with minimal internal turbulence.

• Material: 304 Stainless Steel
• Small End Diameter: 2.50 in
• Large End Diameter: 3.00 in
• Overall Length (OAL): 1-3/16 in
• Manufacturer Part Number: 607-07663-0000

The Stainless Bros 2.0-inch to 3.0-inch transition reducer cone is a precision-engineered component designed for custom exhaust, intake, and forced induction fabrication. With an overall length (OAL) of 2-3/8 inches, this cone provides a smooth internal transition between different tubing diameters, helping to maintain exhaust gas velocity and minimize turbulence.

Manufactured from high-grade 304 stainless steel, this reducer offers exceptional corrosion resistance and is optimized for TIG welding. Its consistent wall thickness and accurate sizing ensure a professional fitment for fabricators building custom downpipes, mid-pipes, or intake runners where space is limited but flow efficiency is critical.

• Material: 304 Stainless Steel (304SS)
• Transition Range: 2.0 inch to 3.0 inch
• Overall Length (OAL): 2-3/8 inch
• Construction: Precision-formed for smooth internal flow
• MPN: 607-07650-0000

This Stainless Bros transition reducer cone is a precision-engineered component designed for custom exhaust, intake, and forced induction fabrication. It provides a smooth, reliable transition between 2.0-inch and 2.50-inch tubing in space-constrained areas, thanks to its compact 1-3/16 inch overall length (OAL).

Fabricated from high-grade 304 stainless steel, this reducer offers superior corrosion resistance and durability, making it suitable for high-heat automotive applications. The material properties ensure excellent weldability for TIG or MIG welding, allowing fabricators to maintain structural integrity and professional-grade finishes on custom projects.

• Material: 304 Stainless Steel (304SS)
• Inlet Diameter: 2.0in
• Outlet Diameter: 2.50in
• Overall Length (OAL): 1-3/16in
• Manufacturer Part Number: 607-06350-0000

The Stainless Bros 2.50in 304 Stainless Steel Slip Joint Connector provides a high-quality, modular solution for custom exhaust fabrication and intake piping. This female/male set is engineered to allow for a secure overlap connection, simplifying the assembly and disassembly of exhaust sections during the build process or for routine maintenance.

• Precision-machined from 304 stainless steel for maximum corrosion resistance and excellent weldability
• 2.50-inch (63.5mm) diameter compatible with standard performance exhaust and intake systems
• Includes one male and one female component for a complete slip-fit connection
• Ideal for race applications, turbo manifolds, and custom exhaust segments requiring a tight, reliable fit
• Manufacturer Part Number: 605-06306-0000

The Stainless Bros 2.25in 304SS Slip Joint Connector Set is engineered for professional exhaust fabricators who require a reliable, leak-resistant connection that allows for easy disassembly and handles thermal expansion. Constructed from high-grade 304 stainless steel, this set provides excellent corrosion resistance and durability in high-heat environments.

This female/male set is precision-engineered to slip together, providing a snug fit for 2.25-inch OD tubing. It is an ideal solution for modular exhaust sections, headers, or any application where a traditional flange or permanent weld might not be practical for serviceability.

• Material: 304 Stainless Steel (304SS)
• Inlet/Outlet Diameter: 2.25 inches
• Connection Type: Male and Female Slip Joint
• Quantity: One (1) Male Connector, One (1) Female Connector
• Manufacturer Part Number: 605-05706-0000

Each set includes one male and one female slip joint component, ready for TIG or MIG welding into your custom exhaust system.

The Stainless Bros M18x1.5 O2 Sensor Bung with Built-in Heat Sink is engineered for high-performance exhaust applications where thermal management is critical. This precision-machined, weld-on component provides a standard mounting point for oxygen sensors, utilizing integrated cooling fins to dissipate excess heat before it can reach the sensor body.

By reducing the thermal load on the sensor element, this bung helps extend the service life of sensitive wideband and narrowband sensors, particularly in high-heat environments like turbocharger downpipes or high-horsepower naturally aspirated manifolds. The heat sink design allows for more stable sensor operation and more reliable air-fuel ratio data during aggressive driving or high-load conditions.

• Thread Pitch: M18x1.5 (Standard O2 sensor sizing)
• Integrated heat sink fins for enhanced thermal dissipation
• Precision-machined for consistent fitment and welding
• Ideal for turbocharged and forced induction exhaust systems
• Manufacturer Part Number: 604-00100-9000

The Stainless Bros M18x1.5 Step Type O2 Sensor Bung is an essential component for professional exhaust fabrication and custom header builds. This precision-machined bung provides a secure, threaded mounting point for standard oxygen sensors or wideband air-fuel ratio gauges.

Designed with a specific "step" shoulder, this bung simplifies the welding process by allowing the part to self-center within a pre-drilled hole in the exhaust tubing. This feature ensures the bung remains stable and properly aligned while you lay your TIG or MIG beads, preventing it from slipping into the pipe. The M18x1.5 thread pitch is the industry standard for most automotive O2 sensors, making this a versatile choice for forced induction setups, downpipes, and naturally aspirated exhaust systems.

• Manufacturer Part Number: 604-00100-8000
• Thread Size: M18 x 1.5
• Profile: Step Type for self-centering fitment
• Application: Custom exhaust systems, turbo downpipes, and headers

The Stainless Bros M18x1.5 O2 Sensor Bung is a precision-machined component designed for professional exhaust fabrication. This weld-on bung features a radius-cut base specifically contoured to sit flush against exhaust piping with an outer diameter ranging from 1.75 inches to 2.50 inches. This design eliminates the gaps found with flat-bottom bungs, ensuring a superior fitment for high-quality TIG or MIG welding.

Threaded to the industry-standard M18x1.5 pitch, this bung is compatible with the vast majority of factory and aftermarket wideband and narrowband oxygen sensors. It is an essential component for custom header builds, downpipes, or adding additional sensor bungs for data logging and tuning equipment.

• Thread Pitch: M18x1.5
• Tube Fitment: 1.75in to 2.50in diameter piping
• Mounting: Weld-on radius cut
• Material: Stainless steel construction
• Manufacturer Part Number: 604-00100-7000

The Stainless Bros M18x1.5 O2 Sensor Bung (Saddle Type) provides a professional, leak-free mounting point for oxygen sensors in custom exhaust systems, headers, or downpipes. Precision-machined to ensure thread accuracy, this bung is a critical component for tuners and fabricators who require reliable Air/Fuel Ratio (AFR) monitoring.

The saddle-style design features a contoured base specifically engineered to sit flush against round exhaust tubing. This profile simplifies the welding process by providing a stable interface that minimizes gaps, resulting in a stronger, cleaner weld compared to standard flat bungs. The M18x1.5 thread pitch is the industry standard for the vast majority of narrowband and wideband O2 sensors.

• Thread Size: M18 x 1.5
• Mounting Style: Saddle-type (contoured base) for tubing applications
• Application: Compatible with most standard automotive O2 sensors and wideband controllers
• MPN: 604-00100-6000

Integrate an oxygen sensor into your custom exhaust system with the Stainless Bros M18x1.5 O2 Sensor Bung. This component is specifically engineered with a contoured base to sit flush against exhaust tubing diameters ranging from 2.75 inches up to 5 inches. The precise radius profile simplifies the welding process, ensuring a secure, leak-free seat for your wideband or narrow-band O2 sensor.

• Thread Pitch: M18 x 1.5
• Fitment: 2.75 inch to 5 inch OD tubing
• Precision-machined for consistent thread engagement
• Contoured base for simplified welding on large-diameter pipes
• Manufacturer Part Number: 604-00100-5000

This Stainless Bros saddle-type O2 sensor bung provides a professional solution for adding oxygen sensor ports to round exhaust tubing. Precision cast from high-grade 304 stainless steel, this component is designed for custom exhaust fabrication where a flat mounting surface is unavailable.

The radius-cut saddle profile allows the bung to seat securely against the contour of the exhaust pipe, facilitating a cleaner weld and ensuring a leak-free installation. Its SS304 construction offers excellent corrosion resistance and superior weldability, making it an essential part for high-performance exhaust systems.

• Material: Cast 304 Stainless Steel (SS304)
• Profile: Round Saddle Type
• Application: Universal O2 sensor mounting for round tubing
• Manufacturer Part Number: 604-00100-4000

Engineered for high-performance fabrication, this Stainless Bros exhaust flange is designed specifically for Audi R8 and Lamborghini Huracan platforms. Precision-machined from 304 stainless steel, it provides a durable, corrosion-resistant solution for builders creating custom exhaust systems, mid-pipes, or high-flow sections. The flange ensures a stable mating surface, critical for preventing leaks under high heat and vibration conditions found in mid-engine supercars.

• Material: Premium 304 Stainless Steel (304SS) for maximum durability and rust resistance.
• Bore Size: 3-inch (76mm) inner diameter to match high-flow exhaust tubing.
• Compatibility: Specifically patterned for Audi R8 and Lamborghini Huracan exhaust mounting points.
• Construction: Heavy-duty thickness to resist warping during the welding process.
• Manufacturer Part Number: 603-41076-2000

Fabricated for high-performance forced induction systems, the Stainless Bros turbine outlet flange is designed specifically for Precision Turbo & Engine (PTE) T4 Pro Mod turbine housings. This flange provides the critical mating surface required to build a custom downpipe or exhaust discharge for 108mm Pro Mod series turbochargers.

Constructed from high-grade stainless steel, this flange is built to withstand extreme exhaust gas temperatures and thermal cycling without warping, ensuring a reliable, leak-free seal under high-boost conditions. The precision-machined profile aligns perfectly with the PTE Pro Mod housing discharge for a professional-grade installation.

• Fits Precision Turbo & Engine (PTE) T4 Pro Mod turbine housings
• 108mm outlet diameter for high-flow exhaust fabrication
• Precision-machined stainless steel construction for superior heat resistance
• Provides a secure mating surface for custom downpipes
• Manufacturer Part Number: 603-10814-6000