This is the PERRIN Performance Big Tube Header. As the name suggests, PERRIN Performance designed this header with a larger piping diameter that is combined with smooth bends. This header is ideal for those of you looking to make big power that would otherwise be limited by the factory exhaust manifold, or other header designs. The larger piping allows the turbocharger to have maximum exhaust flow efficiency to improve the power, performance, and to reduce the overall turbo lag. Although this header is ideal for those looking to make a moderate amount of power through a bigger turbo or even a rotated setup, it will also work well for factory-style turbochargers.
HIGHLIGHTS:
304 stainless steel construction
1.625" tubing diameter
Equal-length manifold layout
Designed with collectors that have been designed to further improve exhaust flow throughout the runners in an equal fashion
2-bolt up-pipe flange
Ideal for those of you looking to make big power
Produces an aggressive race-inspired sound
FITMENT NOTES:
2005-2007 WRX requires 2002-2004 WRX oil cooler assembly and oil feed pipe
2002-2005 WRX requires STi 2.5L oil pan and oil pickup tube as well as custom modification to the radiator line to the transmission
2002-2005 WRX with Automatic transmission requires modifications to the radiator
2004-2008 Forester XT requires STi 2.5L oil pan, oil pickup tube, 2002-2004 WRX oil cooler assembly, and oil feed pipe