Killer B Equal Length 4-1 Performance Holy Header W/Uppipe - WRX 2002-2014 / STI 2004-2017 / More
Killer B Motorsports
The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine the optimal design to increase power as much as possible throughout the rev range. Primaries were made as short as possible along with a single secondary which significantly decrease header volume allowing exhaust gas pressure to build quickly.
Not CARB Legal
The symmetrical 4-1 design maintains high and consistent exhaust velocity as RPMs rise. You can expect significantly faster spool up time compared to long primary/double secondary designs. You will immediately notice an improvement in throttle/boost response and the ability to hold more power higher into the revs.
Short Equal Length Primaries
Thick Walled 321 Stainless Steel Construction for Long Life
321 is alloyed with titanium and costs more, but it’s the ideal material for high temperature turbocharged applications. The temperatures on turbocharged cars can easily exceed the limits of 304 stainless steel enough to make them brittle and crack. 321 stainless steel has higher strength and toughness at high temperatures. It was developed by the aircraft industry specifically to address cracking issues in 304 stainless manifolds. Killer B Motorsport is the only company that manufactures full 321 headers.
High Heat Retention
V-Band Up-Pipe Connection
Works with OEM EJ25 Oil Pans, and Killer B Motorsport Performance Aluminum Oil Pan!
Fits All WRX & STi EJ Series Engines. Designed to work with OEM location turbo.
Made in the USA!
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