Killer B DIY Holy Header Rotated Turbo Subaru WRX 2002-2014 / STI 2004-2021 | HH-DIY vendor_Wheel Mate Spring Rates: (F) 8kg/mm (R)

Spring Rates: (F) 8kg/mm (R) 6kg/mm

All Brian Crower Evolution X cams are checked on a high speed

Fast Motorsports has solved the problem for us by producing this heavy duty

the kit includes everything needed to get started

now you can easily learn the Exaust temperature & how your modifications will affect the engine performance

Killer B DIY Holy Header Rotated Turbo Subaru WRX 2002-2014 / STI 2004-2021 | HH-DIY vendor_Wheel Mate Spring Rates: (F) 8kg/mm (R)Part #: HH DIY The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine optimal design to increase power in the mid to high RPM range. Short as possible primaries with a single secondary significantly decrease header volume allowing exhaust gas pressure to build quickly. Symmetrical 4 1 design maintains high and consistent exhaust velocity as RPMs rise. You can expect faster spool up time