Stage 4 CNC Ported Cylinder Head Package for 15-20 WRX AW20 Castings (Cams / Rockers / Lash Caps Sold Separately). 2001-subaru-outback-base The pan is designed to

The pan is designed to use the included OEM style Viton dipstick o-rings with a unique chamfer to aid in the installation of the dipstick

0L S20 head castings directly from Subaru of America

Bilstein B16 (PSS10) suspension kits feature ride height adjustability with 10-stage manually adjustable dampers in an OE quality

Replaces the OEM plastic bracket which is known to break

the heads are reassembled using GSC Billet S2 camshafts that are intended for vehicles making 500-700 wheel horsepower

Stage 4 CNC Ported Cylinder Head Package for 15-20 WRX AW20 Castings (Cams / Rockers / Lash Caps Sold Separately). 2001-subaru-outback-base The pan is designed toIAG's Stage 4 Cylinder Head Package for the 2015 20 WRX utilizes a CNC porting program for the AW20 heads which was developed over the past year and tested on the most successful high horsepower Subarus. The ported head package starts with brand new AW20 WRX OEM head castings directly from Subaru of America. The bare castings are visually inspected and the OEM guides are pressed out. The heads are then fixtured into our in house Centroid 5 axis CNC