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dyno testing
All of our assembly is done in-house in our clean room to ensure excellent quality control
2016 Subaru WRX STI Series
Killer B Equal Length 4-1 Holy Header EJ Series 2-Bolt Camshafts Image may be a representationThe Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine the optimal design for increasing power as much as possible throughout the rev 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
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