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


The Killer B Motorsport Holy Header Max was developed using state-of-the-art CAD software & simulations to determine optimal design to increase efficiency as much as possible throughout the rev range. With a 2.5" secondary the Holy Header Max is for high flow applications. 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
- Larger Secondaries = Increased to 2.5inch for higher flow rates
- Smooth Mandrel bends = Non-Restrictive Flow
- +35 WTQ / +35 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

More Information
Color Stainless Steel
Manufacturer Killer B Motorsport
Price 1,499.00
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