Killer B Motorsport 4-1 Holy Header WRX/STi 2004+ (HH4-1)

Killer B Motorsports

HH4-1

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.


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