Part Number: HH-2BOLT

Description: Equal Length 4-1 Holy Header 2-Bolt

Notes:  02-05 Subaru WRX 2.0L engines will need the 2.5L STI oil pan install kit.

Parts Needed (Sold Separately):

Subaru 06+ STi Oil Dipstick Part Number: 11140AA150

Subaru 99-08 Impreza 2.5L w/ Turbo / 05 Legacy/Outback w/ Turbo Oil Pan Part Number: 11109AA131

Subaru EJ25 Oil Pick Up Tube Part Number: 15049AA110

GrimmSpeed 02-10+ WRX/STi/LGT Exhaust Manifold to Cylinder Head Gasket Pair Part Number: 020001

GrimmSpeed 02-10+ WRX/STi/LGT Manifold to Uppipe 2X Thick Gasket Part Number: 027001

Fitment: 02-07 Subaru WRX & STI

Not for sale or street use in CA & CARB states.

Details:

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 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 compared to long primary/double secondary designs. A difference you will immediately notice in throttle/boost response and the ability to hold more power higher into the revs.