Killer B Equal Length 321 Stainless 4-1 Holy Header 2-Bolt w/EGTNote: EJ20 Motors will require EJ25 Oil Pan and Pickup for installation. 06 07 WRX STI and 03 08 Forester XT will need to modify OEM oil cooler assembly. Click here for instructions. The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine optimal design to increase power as much as possible throughout the rev range. Short as possible primaries with a single secondary significantly decrease
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