Killer B Motorsport 4-1 Holy Header Exhaust Manifold DIY Rotated 2002-2014 WRX / 2004-2021 STI Coating Option:Raw especially if combined with other

especially if combined with other cooling system upgrades

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This kit is included with the water temperature sensor in 1/8 NPT thread pitch for easy installation

Killer B Motorsport 4-1 Holy Header Exhaust Manifold DIY Rotated 2002-2014 WRX / 2004-2021 STI Coating Option:Raw especially if combined with otherThe 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 compared to long