Killer B Holy Headers WRX / STI Subaru Turbo Models EJ20/EJ25 2002-2021 | HH4-1 discontinued-with-inventory The Turbo XS 4-Bolt 3-inch

The Turbo XS 4-Bolt 3-inch Gasket for this exhaust is available to purchase separately

Preload is separate from ride height

baddest mammer-jammer bolt-on turbo for the Subaru WRX/STi offered by Blouch Performance Turbo

Lower Springs × 4

Killer B Holy Headers WRX / STI Subaru Turbo Models EJ20/EJ25 2002-2021 | HH4-1 discontinued-with-inventory The Turbo XS 4-Bolt 3-inchPart #: HH4 1 The Killer B Motorsport Holy Header for the Subaru WRX STI was developed using state of the art CAD software & simulations to determine optimal design to increase power in the mid to high RPM 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