Killer B Motorsport 4-1 Holy Header 2-Bolt Subaru WRX 2002-2014 / STI 2004-2021 | HH-2BOLT vendor_HT Autos This kit includes all hardware

This kit includes all hardware for installation and the Mishimoto Lifetime Warranty

The Fidanza 06-11 Civic Si flywheel is SFI Certified

Professional engine assembly recommended

Compatible with the factory shift knob or any aftermarket knobs designed to replace the factory unit

engineered specifically for the upgraded core

Killer B Motorsport 4-1 Holy Header 2-Bolt Subaru WRX 2002-2014 / STI 2004-2021 | HH-2BOLT vendor_HT Autos This kit includes all hardwarePart #: HH 2BOLT 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