Killer B EL 4-1 Holy Header/Up-Pipe - w/ SwainTech Coating & EGT Bung - 2004-2021 Subaru STI / 2002-2014 WRX, 2004-2013 Forester XT / 2004-2009 Outback XT / 2004-2009 Legacy GT Cobb Accessports Simple features like Preset Colors

Simple features like Preset Colors make it easy to use

Wrap yourself in HKS luxury and honor its legacy with each use of the HKS Big Towel Oil Color

Designed to fit most standard valve stems

5psi (3Bar) at 75 degree Fahrenheit average fuel temperature using CF-16B calibration fluid

The result is a truly equal-length configuration with minimal variation in bend angles—crucial for extracting maximum performance from the FA24’s twin-scroll setup

Killer B EL 4-1 Holy Header/Up-Pipe - w/ SwainTech Coating & EGT Bung - 2004-2021 Subaru STI / 2002-2014 WRX, 2004-2013 Forester XT / 2004-2009 Outback XT / 2004-2009 Legacy GT Cobb Accessports Simple features like Preset ColorsKiller B Motorsport 321 Stainless Holy Header Up Pipe 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 decrease header volume significantly, allowing exhaust gas pressure to quickly build. Symmetrical 4 1 design maintains high and consistent exhaust velocity