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

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

Part #: 015TL522TUV

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

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