Killer B Motorsport 4-1 Holy Header Exhaust Manifold w/ 2-Bolt Flange 2002-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2004-2009 Outback XT / 2004-2009 Legacy GT GROUP_Drivetrain The kit includes high-quality 1200cc

The kit includes high-quality 1200cc Bosch EV14 injectors paired with anodized top feed fuel rails compatible with E85 fuel

This knob is designed for 5-speed transmissions

Built on Turbo XS’s innovative modular "XS" BOV platform

Full aluminum construction enhances cooling efficiency

Killer B Motorsport 4-1 Holy Header Exhaust Manifold w/ 2-Bolt Flange 2002-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2004-2009 Outback XT / 2004-2009 Legacy GT GROUP_Drivetrain The kit includes high-quality 1200ccThe 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