IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves & GSC S2 Camshafts for 02-05 WRX 2.0L S20. 2005-subaru-impreza-wrx improves crankcase ventilation and is

improves crankcase ventilation and is compatible with standard ECU calibrations

Our test cars serve as daily drivers

906" H13 wrist pins are added to finish the Magnum short block

MagnaFlow 11-14 Subaru Impreza / 15-19 Subaru WRX/STI Competition Axle Back w/ Quad Polished Tips

2004-08 Forester XT

IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves & GSC S2 Camshafts for 02-05 WRX 2.0L S20. 2005-subaru-impreza-wrx improves crankcase ventilation and isIAG Stage 4 Ported Heads with +1mm GSC Valves & Cams: IAG's Stage 4 Cylinder Head Package utilizes a CNC porting program for the WRX STI heads that was developed over the past five years and tested on the most successful high horsepower Subarus. The ported head package starts with brand new WRX S20 head castings directly from Subaru of America. The bare castings are visually inspected then fixtured into our in house Centroid 5 axis CNC Machine, one of