Killer B Holy Header Equal Length 2-Bolt Header, 2002-2014 WRX & 2004-2021 STi

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 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 primary/double secondary designs. A difference you will immediately notice in throttle/boost response and the ability to hold more power higher into the revs.

Included:
• Killer B Motorsport 321 Stainless Steel Holy Header With 2-Bolt Flange

Features:
• The collector is thick walled cast 347 (321) stainless.
• Short means less header volume and quick spool up.
• Symmetrical Primary Design.
• Smooth Mandrel Bends.
• Thick Walled 321 Stainless Steel Construction for Long Life.
• High Heat Retention.
• Made in the USA and Killer B quality!