Products

The Kartboy RearEndlinks have been designed using premium materials to be direct replacements for your OEM front endlinks that become weak over tim...

The Kartboy rear endlinks replace the stock (plastic with rubber bushings) rear anti-sway bar droplinks with a solidly designed, CNC cut and hard a...

The Kartboy Rear shifter bushing replaces the soft factory rubber bushing. It works in conjunction with the Kartboy shifter bushings to help stabil...

The Kartboy Subframe Lock kit is engineered to lock the rear subframe in the WRX. It prevents the rear subframe from moving under heavy lateral loa...

For the extra bit of style and performance, add a Kartboy Shift Knob to your Kartboy Shift Lever (works with the stock lever as well.) This compute...

For the extra bit of style and performance, add a Kartboy Shift Knob to your Kartboy Shift Lever (works with the stock lever as well.) This compute...

Kartboy is one of the few companies that can take greatness, and give it an extra side of maple syrup. So good. For you WRX owners, they have relea...

New style cable shifter bearing kit. Replaces the stock rubber bushing on the lower cable to the transmission shift arm.Assembly tool included. Eas...

Shifter Bushings to remove compliance in the mounting of the shift lever to the body and transmission.

Shifter Bushings to remove compliance in the mounting of the shift lever to the body and transmission.

Kartboy Combos are a great way to save a little money when ordering Kartboy items together. All the items in these combos are listed separately on ...

This Kartboy Short Shifter replaces the stock shift lever in 2002-2007 Subaru WRX and the 2000-2004 Subaru Legacy. Overall shift throw is decreased...

This Kartboy Short Shifter replaces the stock shift lever in 2004+ Subaru STI. Overall shift throw is decreased by 40%, providing a noticeable diff...

The Kartboy Short Throw Shifter is a direct replacement for your stock unit, and it has been designed to reduce the shift throw by as much as 40%. ...

Kartboy Transmission Cross Member Bushings

These spacers are required when using Kartboy front endlinks with Whiteline and most other front anti-roll bars.

Made from precision cast aluminum, a reliability upgrade from the plastic failure prone OEM version. Long swoopy bends reduce turbulence, increase ...

Made from precision cast aluminum, a reliability upgrade from the plastic failure prone OEM version. Long swoopy bends reduce turbulence, increase ...

The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine optimal design to increase pow...

The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine optimal design to increase pow...

The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine optimal design to increase pow...

Made from precision cast aluminum, a reliability upgrade from the plastic failure prone OEM version. Long swoopy bends reduce turbulence, increase ...

Features Accelerated flow of blow-by gasses forces suspended oil droplets out of suspension. Centrifugal filtration is a proven process for separat...

Accelerated flow of blow-by gasses forces suspended oil droplets out of suspension. Centrifugal filtration is a proven process for separation of m...

This is the ultimate oil pan package that includes Killer B Motorsport's oil pan that has been designed to hold more oil while providing clearance ...

The Killer B Performance V4 Performance Oil pan is designed to reliably meet the demands of high performance Subaru Engines used on street or track...

More power due to the reduction in oil interfering with the rotation of the crank and allowing it to spin more freely. Unless it’s in the bearings,...

**Special Order 30 Day Lead Time From Killer B** Only intended for highly modified track cars, specifically with a boxer engine, able sustain +1.4G...

Special Order 30 Day Lead Time From Killer B Only intended for highly modified track cars, specifically with a boxer engine, able sustain +1.4Gs co...

This kit contains all the hardware that comes with the Killer B Motorsport oil pan.

The Killer B Motorsport Relocated Oil Fill Tube changes the location of the oil fill tube and cap. This product was designed from customer requests...

NOT a Copolymer Shift Knob. Made from the superior material Delrin. Wonderful feel to this material, never too hot or too cold. The Delrin Shift Kn...

NOT a Copolymer Shift Knob. Made from the superior material Delrin. Wonderful feel to this material, never too hot or too cold. The Delrin Shift Kn...