Killer B Equal Length 4-1 Performance Holy Header W-Uppipe - Fits Subaru WRX 2002-2014 - STI 2004-2019 - More subaru-forester-2002 The original and best: The

Killer B Equal Length 4-1 Performance Holy Header W-Uppipe - Fits Subaru WRX 2002-2014 - STI 2004-2019 - More subaru-forester-2002 The original and best: TheThe Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine the optimal design to increase power as much as possible throughout the rev range. Primaries were made as short as possible along with a single secondary which significantly decrease header volume allowing exhaust gas pressure to build quickly. Not CARB Legal The symmetrical 4 1 design maintains high and consistent exhaust velocity as RPMs

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