Fits 2004-2007 Subaru WRX STI and 2004-2008 Subaru Forester XT.

Engineered to eliminate the deflection and lag associated with factory-equipped endlinks, these Kartboy rear sway bar endlinks provide a more direct connection between your sway bar and the control arms. By replacing the flexible OE components with rigid, CNC-machined units, you ensure that sway bar energy is transferred immediately during cornering, significantly sharpening turn-in and reducing body roll.

• Construction: CNC machined 6061-T6 aluminum for maximum rigidity and weight savings.
• Bushings: Specialized stiff urethane bushings to minimize compliance while maintaining durability.
• Hardware: Includes high-grade installation hardware for a direct bolt-on replacement.
• Design: Hand-crafted in the USA with a focus on long-term performance in enthusiast applications.
• Manufacturer Part Number: KB-017-STI-R

Fits select 2002-2014 Subaru WRX and WRX STi (Sedan), 2005-2012 Subaru Legacy GT, and Subaru Forester models.

Eliminate the flex and potential failure points of factory suspension components with Kartboy Front Swaybar Endlinks. Many OE endlinks use plastic bodies or thin metal rods that deflect under heavy cornering loads, especially when paired with stiffer aftermarket sway bars. Kartboy engineered these replacements to provide a rigid, direct connection between the control arm and the sway bar, ensuring immediate stabilizer bar activation and more predictable handling.

• Solid CNC-machined construction for maximum rigidity and durability
• Heavy-duty urethane bushings minimize deflection compared to soft factory rubber
• Direct bolt-on replacement for the original equipment front links
• Compatible with both factory and upgraded aftermarket sway bars
• Includes all necessary hardware for a complete installation
• Manufacturer Part Number: KB-017-FRONT

Fits 2015-2021 Subaru WRX and WRX STI.

Improve your vehicle's handling and suspension response with the Kartboy Front Sway Bar Endlinks. Designed to replace the flexible factory units, these endlinks provide a solid connection between the sway bar and the control arms, ensuring that your anti-roll bar begins working immediately during cornering rather than waiting for OEM plastic or rubber components to deflect.

Kartboy constructs these endlinks using CNC-machined 6061-T6 aluminum for maximum rigidity and weight savings. Each unit is equipped with high-durometer urethane bushings that offer a significant increase in stiffness over stock while maintaining long-term durability. These are a direct bolt-on replacement, engineered to withstand the increased loads of aftermarket sway bars and spirited driving.

• CNC-machined 6061-T6 aluminum construction
• High-durometer urethane bushings for reduced deflection
• Direct bolt-on installation using factory mounting points
• Includes 12mm hardware for a secure fit
• Hand-built in the USA
• Manufacturer Part Number: KB-017-F-12MM

Fits select 2008-2021 Subaru WRX, WRX STI, and BRZ, plus 2010-2012 Legacy GT models.

Sharpen your vehicle's handling and suspension response with Kartboy Rear Swaybar Endlinks (MPN: KB-017-08+REAR). These units are designed to replace the compliant factory links that often flex under load, causing a delay in swaybar engagement. By switching to a solid link, you eliminate deflection and ensure your rear swaybar—whether OEM or aftermarket—performs at its maximum potential during cornering.

• CNC machined from solid 6061-T6 aluminum for superior strength and rigidity
• Equipped with hand-poured 95-durometer urethane bushings for a precise feel
• Direct bolt-on replacement for the original equipment (OE) hardware
• Includes all necessary high-grade mounting hardware for a complete install
• Engineered and manufactured in the USA

Fits select 1998-2007 Subaru Impreza, 2002-2005 Subaru WRX, and 2000-2009 Subaru Legacy.

The Kartboy Rear 2-Pot Big Brake Adapters (KB-016-2POT-V2) provide a precise mounting solution for enthusiasts upgrading to FHI-style 2-pot fixed rear calipers. These brackets allow you to replace factory single-piston sliding calipers with the more robust 2-pot units found on higher-trim models, significantly improving braking performance and heat dissipation. Each adapter is engineered to ensure the caliper is perfectly centered over the rotor for optimal pad sweep and consistent pedal feel.

• Precision CNC-machined for exact fitment on factory knuckles
• Enables installation of FHI/Subaru 2-pot rear fixed calipers
• High-strength construction to withstand heavy braking loads
• Replaces standard sliding caliper mounts
• Manufacturer Part Number: KB-016-2POT-V2

Fits select 2002-2024 Subaru WRX, 2004-2021 WRX STi, and 2005-2009 Legacy GT.

The Kartboy Pitch Stop Mount is designed to control the longitudinal movement of the engine and transmission. By replacing the soft, factory-equipped plastic and rubber mount with this rigid performance upgrade, you significantly reduce the "pitching" motion of the drivetrain during hard acceleration, braking, and gear changes. This results in a more connected driving feel and improved throttle response by ensuring more power is directed to the wheels rather than being absorbed by engine movement.

• Replaces factory part to eliminate drivetrain slop and engine pitching
• Enhances shifter feel and overall vehicle responsiveness
• Durable, solid construction built for performance use
• Direct bolt-on installation using factory mounting points
• Manufacturer Part Number: KB-015-PITCH

Fits select Subaru models equipped with a 5-speed manual transmission.

The Kartboy Knuckleball Shift Knob is a driver-focused upgrade designed to improve tactile feedback and cabin ergonomics. Precision-machined from solid Black Delrin, this shift knob solves the common problem of temperature transfer. Unlike traditional metal knobs that become uncomfortably hot in the summer or freezing in the winter, Delrin provides excellent thermal insulation for a comfortable grip in any climate.

The "Knuckleball" profile is engineered to fit naturally in the palm, allowing for more precise gear changes whether you prefer a side-grip or top-down shifting style. This unit is a direct replacement for the factory knob and threads onto the original shifter lever without the need for adapters.

• Machined from high-quality Black Delrin for durability and temperature resistance
• Ergonomic spherical shape for improved shift feel and leverage
• Specifically designed for Subaru 5-speed manual gearboxes
• Threaded for a direct factory-style installation
• MPN: KB-014-BD-5SPD

The Kartboy Knuckleball Shift Knob (KB-014-B-6SPD) is a precision-engineered upgrade designed to improve the tactile feedback and ergonomics of your Subaru's manual transmission. Featuring the iconic "Knuckleball" spherical profile, this knob provides a comfortable and natural grip that enhances gear selection during both spirited driving and daily commuting.

This shift knob is specifically tailored for Subaru 6-speed applications, ensuring seamless compatibility and clearance for the factory reverse lockout lever. It serves as a direct-fit replacement for the stock unit, offering an understated interior aesthetic with its durable black finish. Built to handle the rigors of constant use, the Kartboy Knuckleball provides a more connected feel to the drivetrain compared to standard plastic or leather-wrapped alternatives.

• Manufacturer Part Number: KB-014-B-6SPD
• Fitment: Subaru 6-Speed Manual Transmissions
• Finish: Black
• Design: Ergonomic "Knuckleball" Spherical Shape
• Installation: Direct-fit threaded replacement
• Compatibility: Accommodates factory reverse lockout

Fits 1993-2007 Subaru Impreza, WRX, and WRX STi.

The Kartboy 15mm Exhaust Hanger (KB-011-B-15MM) is engineered to eliminate the excessive movement, swaying, and rattling common with soft, worn-out factory rubber hangers. These high-stiffness polyurethane hangers provide a much more secure mount, preventing the exhaust from contacting the chassis or bumper even under aggressive driving conditions or with heavier aftermarket piping.

• Increased Rigidity: Stiff polyurethane construction resists heat and chemicals better than OEM rubber.
• Bore Size: 15mm diameter designed for specific Subaru exhaust hanger pins.
• Direct Replacement: Installs into the factory locations with no modifications required.
• Finish: Stealthy black color for a clean, understated look.
• MPN: KB-011-B-15MM

Fits 1993-2007 Subaru Impreza, WRX, and WRX STi.

The Kartboy Long Exhaust Hanger is engineered to provide additional clearance for aftermarket exhaust systems, oversized muffler tips, or aero-heavy rear bumpers. This high-durometer hanger replaces soft factory rubber components to eliminate excessive exhaust sway and vibration, preventing the muffler from contacting the chassis or melting the bumper trim during spirited driving or track sessions.

• Bore Diameter: 15mm
• Extended length for improved tip-to-bumper clearance
• Direct replacement for factory rubber hangers
• Durable construction prevents sagging over time
• Finish: Black
• Manufacturer Part Number: KB-011-15MMXL

Fits select 2005-2021 Subaru WRX, WRX STi, and Legacy GT models. This extended-length hanger is designed to provide the necessary clearance for aftermarket exhaust systems that sit too close to the rear bumper or chassis.

The Kartboy KB-011-12MMXL 12mm Long Exhaust Hanger is a direct replacement for soft factory rubber bushings. Made from a stiff, high-durometer polyurethane, these hangers eliminate excessive exhaust movement and sway, preventing the mid-pipe or muffler from rattling against the vehicle's body. The extended length is particularly useful for vehicles with modified exhaust paths or larger diameter piping that require additional drop to avoid heat damage or vibration.

• Replaces soft OE hangers to eliminate exhaust sway and rattling
• Extended length provides additional clearance for aftermarket exhaust tips
• High-durometer polyurethane construction for long-term durability
• Mounting hole diameter: 12mm
• Finish: Black
• Manufacturer Part Number: KB-011-12MMXL

Fits 2005-2009 Subaru Legacy GT and 2008-2021 Subaru WRX / WRX STI.

The Kartboy KB-011-12MM Exhaust Hanger is engineered to replace soft factory rubber bushings that allow for excessive exhaust movement. By utilizing a high-durometer polyurethane construction, this 12mm hanger provides a much stiffer mounting point, eliminating exhaust sway and preventing your tips from contacting the bumper or chassis during spirited driving. This is a common and effective upgrade for vehicles equipped with aftermarket cat-back or axle-back exhaust systems that require more stability than the OE hangers can provide.

• Bore Size: 12mm
• Material: High-durometer polyurethane
• Color: Black
• Stiffens exhaust mounting to prevent clunking and swaying
• Direct replacement for factory rubber hangers
• Manufacturer Part Number: KB-011-12MM

Fits select Subaru models.

The Kartboy 10mm Exhaust Hanger is engineered to solve the common issue of excessive exhaust movement found with factory rubber hangers. Standard OE hangers are often too soft, allowing the exhaust system to sway during spirited driving or rattle against the chassis and aftermarket sway bars. This high-durometer black hanger provides a much stiffer connection to keep your exhaust piping exactly where it belongs.

Ideal for both stock and aftermarket exhaust systems, this 10mm hanger is a direct replacement that slides onto the vehicle's factory mounting rods. By minimizing exhaust swing, it helps maintain consistent clearances and prevents the damage or annoying vibrations caused by exhaust contact.

• Diameter: 10mm
• Color: Black finish
• Manufacturer Part Number: KB-011-10MM
• Application: Replaces soft factory rubber exhaust hangers
• Construction: Durable, high-durometer compound

Fits select 2004-2021 Subaru WRX STI (6-Speed) and 2007-2009 Subaru Legacy GT Spec.B.

The Kartboy Front Shifter Bushing is a critical upgrade for drivers looking to eliminate the vague, rubbery sensation common in factory Subaru shift linkages. By replacing the compliant OEM rubber bushing with this high-performance alternative, you significantly reduce deflection and play, resulting in a more tactile, mechanical feel and more precise gear engagement.

• Direct replacement for the soft factory front shifter bushing
• Improves shifting precision and feedback by reducing linkage compliance
• Designed for a straightforward bolt-on installation using factory hardware
• Engineered to withstand the rigors of spirited driving and daily use
• Manufacturer Part Number: KB-003-STI

Fits select 2002-2014 Subaru WRX and 2004-2021 Subaru WRX STi.

Improve your shifting precision and eliminate drivetrain slop with the Kartboy Rear Shifter Bushing (KB-003-REAR). The factory rear stay bushing is manufactured from soft rubber designed to isolate vibration, which often results in a vague, mushy sensation when changing gears. This high-durometer replacement provides a more connected, tactile response by firmly securing the rear of the shift linkage to the floorboard.

• Replaces the soft factory rear shifter stay bushing
• Reduces mechanical play for a more precise, notched shift feel
• Constructed from durable, high-durometer polyurethane for long-term performance
• Simple bolt-on installation using factory mounting points
• Manufacturer Part Number: KB-003-REAR

Fits 2002-2007 Subaru WRX and 2004-2007 Subaru WRX STI models.

The Kartboy Rear Differential Bushing Kit (Soft) is engineered to replace the compliant factory rubber bushings that allow the rear differential to move excessively under load. By stabilizing the differential carrier, these bushings help eliminate the common drivetrain "thump" felt during hard shifts and improve the overall transfer of power to the ground.

Constructed from high-quality polyurethane, the Soft variant is specifically tuned for enthusiasts who want to reduce drivetrain slop while maintaining street-friendly comfort. These bushings provide a more connected feel without the significant increase in noise, vibration, and harshness (NVH) often associated with harder race-spec components.

• Reduces rear differential movement and drivetrain slop
• Soft durometer polyurethane for street-friendly performance
• Improves shifting feel and power delivery
• Direct replacement for OEM bushings
• Manufacturer Part Number: KB-003-DIFF-S

Fits 2002-2007 Subaru WRX and 2004-2007 Subaru WRX STi.

The Kartboy Hard Rear Differential Bushing Kit (KB-003-DIFF-H) stabilizes the rear differential by replacing the soft, high-compliance factory rubber bushings. Engineered for enthusiasts seeking a more connected driveline feel, these high-durometer bushings eliminate the common "thumping" sensation during aggressive launches and hard gear changes. By minimizing differential movement, this kit ensures more direct power delivery to the wheels and sharper throttle response.

• High-durometer polyurethane construction for maximum rigidity
• Reduces driveline slop and differential deflection
• Direct replacement for OEM bushings in the rear subframe
• Ideal for track use or high-horsepower street applications
• Manufacturer Part Number: KB-003-DIFF-H

Fits 2015-2025 Subaru WRX models equipped with a manual transmission.

The Kartboy Shifter Bearing Kit (KB-003-B) is engineered to solve the vague, rubbery shift feel common in the 2015+ WRX cable-shifter system. By replacing the compliant factory rubber bushing at the transmission-side cable end with a precision-machined bearing, this kit creates a more direct, mechanical connection between the driver and the gearbox.

• Eliminates shifter cable slop for more positive gear engagement
• Replaces the soft OE rubber bushing to restore a crisp, firm feel
• Precision-machined construction ensures tight tolerances and long-term durability
• Direct-fit replacement that installs onto the factory shifter cable assembly
• Manufacturer Part Number: KB-003-B

Fits 2002-2014 Subaru WRX and select 5-speed manual transmission models including Impreza, Legacy, and Forester.

The Kartboy Front Shifter Bushing (KB-003-5SPD) is engineered to eliminate the vague, spongy feel common in factory Subaru 5-speed linkages. By replacing the soft, compliant original equipment rubber bushing with a much stiffer polyurethane compound, this upgrade significantly reduces shifter "slop" and provides a more precise, tactile gear selection.

Constructed from high-durometer polyurethane, these bushings are designed to withstand the heat and stress of the drivetrain environment while maintaining their shape. This is a direct replacement for the factory front shifter stay bushing, bolting into the existing housing to bridge the gap between the shifter rod and the transmission. Whether you are daily driving or at the track, this modification provides the mechanical feedback necessary for confident, crisp shifts.

• Part Number: KB-003-5SPD
• Material: Stiff high-durometer polyurethane
• Reduces shifter play and improves engagement feel
• Direct replacement for the factory front stay bushing
• Designed for Subaru 5-speed manual transmissions

Fits 2002-2007 Subaru WRX models. The Kartboy Short Throw Shifter (KB-002-WRX) is engineered to transform the shifting experience by reducing the distance the lever travels between gears. This modification eliminates the vague, rubbery feel often associated with the factory unit, providing a more mechanical and precise engagement.

Constructed from CNC-cut and TIG-welded structural steel, this shifter is designed to withstand aggressive use while maintaining strict tolerances. It features a durable black powder-coated finish and is designed as a direct bolt-in replacement for the OEM lever, allowing you to retain the factory shift boot and knob for a clean interior aesthetic.

• Provides an approximate 40% reduction in shifter throw
• Reduces overall shifter height by approximately 1 inch
• CNC-machined and TIG-welded steel construction for maximum rigidity
• Direct bolt-on installation using factory mounting points
• Manufacturer Part Number: KB-002-WRX
• Made in the USA

Fits select 1998-2005 Subaru Forester and 2003-2006 Subaru Baja XT models.

The Kartboy Short Shifter (KB-001-XT) is engineered to transform the driving experience by significantly reducing the throw of the gear lever. Designed as a direct replacement for the factory unit, this shifter eliminates the vague, rubbery sensation often associated with high-mileage OE components, providing a mechanical and positive engagement for every gear change.

• Reduces shift throw for quicker, more precise gear transitions
• CNC machined for exact tolerances and long-term durability
• Compatible with factory shift knobs and boots
• Easy installation using common hand tools
• Retains factory mounting points for a secure fit
• Manufacturer Part Number: KB-001-XT

Fits select 1997-2001 Subaru Impreza, 1997-1999 Subaru Legacy, and 2002-2007 Subaru WRX models equipped with the SPT (Subaru Performance Tuning) shifter.

The Kartboy RS Short Shifter is engineered to replace the factory lever, significantly reducing the throw distance for more precise and confident gear changes. Designed specifically for enthusiasts seeking a more connected feel, this shifter eliminates the vague, rubbery sensation often found in high-mileage OE components. It installs into the factory shifter housing for a straightforward upgrade to your drivetrain's tactile feedback.

• Reduces shift throw for faster, more accurate gear engagement
• Compatible specifically with models equipped with the SPT shifter option
• Direct replacement for the original shifter lever
• Crafted for long-term durability and consistent performance
• Manufacturer Part Number: KB-001-RS

Fits select 2006-2014 Subaru WRX, Legacy GT, and Forester XT models equipped with 5-speed manual transmissions.

The Kartboy Short Shifter (MPN: KB-001-LEG) is a precision-engineered upgrade designed to replace the vague, long-throw factory shift lever. By reducing the overall throw distance and shifter height, this component provides a shorter, crisper gate engagement and a more connected feel to the transmission. It is an essential modification for enthusiasts looking to eliminate the rubbery sensation of the stock shift assembly.

• Direct replacement for the factory shifter lever
• Reduces shift throw for faster and more precise gear changes
• CNC-machined construction for durability and zero-flex performance
• Maintains factory shift knob thread pitch
• Designed and manufactured in the USA
• Manufacturer Part Number: KB-001-LEG