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Ships within 48 hours · Estimated delivery Sep 23 - Sep 28
+ 1 mm over size
The knob weighs in at a lightweight 113
BC 4340 billet steel crankshaft (79mm stroke)
Includes stainless steel clamps
75" Aluminum piping
Killer B Motorsport 4-1 Holy Header 2-Bolt Subaru WRX 2002-2014 / STI 2004-2021 | HH-2BOLT SkylineR34_1999-2002 + 1 mm over sizePart #: 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
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