Killer B EL 4-1 Holy Header/Up-Pipe - EGT Bung - 2004-2021 Subaru STI / 2002-2014 WRX, 2004-2013 Forester XT / 2004-2009 Outback XT / 2004-2009 Legacy GT PDM_battery-tie-downs-and-trays bringing the car closer to

bringing the car closer to its performance potential

Fits the 2015-2021 Subaru WRX STI EJ257 VA chassis

After the closed deck conversion

This rear roof spoiler installs just above your rear hatch glass for a simple installation

hardware which includes banjo bolts

Killer B EL 4-1 Holy Header/Up-Pipe - EGT Bung - 2004-2021 Subaru STI / 2002-2014 WRX, 2004-2013 Forester XT / 2004-2009 Outback XT / 2004-2009 Legacy GT PDM_battery-tie-downs-and-trays bringing the car closer toKiller 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