IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves & GSC S2 Camshafts for 02-05 WRX 2.0L S20. 2005-subaru-impreza-wrx MagnaFlow 11-14 Subaru Impreza /

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IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves & GSC S2 Camshafts for 02-05 WRX 2.0L S20. 2005-subaru-impreza-wrx MagnaFlow 11-14 Subaru Impreza /IAG 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

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