IAG Stage 5 CNC Ported Heads w/ +1mm Ferrea Valves & GSC S3 Cams for 08-17 STI W25 Casting. 2017-subaru-wrx sti-sport-tech 210" 9310 Steel Wrist Pins

210" 9310 Steel Wrist Pins are added to finish the Stage 2

What sets this gasket apart from others is the separate stainless steel rings surrounding the bore holes

When installing the product the smoked film is applied first and then the red film is applied and cut out to reveal the smoked film using the included template

Once all the new guides are in place they are diamond-honed in our honing station

IAG Stage 5 CNC Ported Heads w/ +1mm Ferrea Valves & GSC S3 Cams for 08-17 STI W25 Casting. 2017-subaru-wrx sti-sport-tech 210" 9310 Steel Wrist PinsIAG's Stage 5 Cylinder Head Package utilizes a CNC porting program for the W25 heads that was developed over the past five years and tested on the most successful high horsepower Subaru's. The ported head package starts with brand new W25 OEM WRX STI 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 the most advanced precision engine machining