Killer B Motorsport 4-1 HOLY Equal Length Header 2 Bolt WRX / STI

Special Price $1,259.10 Regular Price $1,399.00

NOT CARB LEGAL, No Shipping To California

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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.

- Material 321 Stainless Steel = Surpasses 304 Stainless Steel Limits and Longevity
- Cast Collector = Increase flow / Decreces Turbulence
- Short Equal Lenght Primaries = Less Header Volume / Quicker Spool Time
- Smooth Mandrel bends = Non-Restrictive Flow
- +25 WTQ / +25 WHP on average
- Keeps Some of the Subaru Rumble
- Fits OEM EJ25 Oil Pans
- 2-Bolt Uppipe Connection
- Weight 17lbs

- 1 x KillerB 2 Bolt True Equal Length Header

- Does not Include Any Gaskets
- Does not Include Any Hardware such as Studs
- Perfect fit! (some WRX models may require OEM Oil Cooler to be rotated)

2002-2007 WRX
2004-2007 STI
2008-2014 WRX
2008-2014 STI
2015-2021 STI

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