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IAG's Stage 5 Cylinder Head Package utilizes a CNC porting program for the B25 heads that was developed over the past five years and tested on the most successful high-horsepower Subarus
Once all the new intake and exhaust guides are in place they are diamond-honed in our honing station
The Street Series AOS design is based on years of extensive testing on standard and competition applications
GTIN: 00887753780317
Our latest bracket design relocates the alternator without requiring any modifications to the OEM bracketry or oil dip stick mounting for the EJ25
Stage 2 Pocket Ported Cyl Heads, Chamber Mod, S20 Casting(Cams/Lifters Not Inc) 2011-subaru-impreza-wrx sti limited IAG's Stage 5 Cylinder HeadIAG Stage 2 Pocket Port Cylinder Head Package: The head package centers around our popular CNC pocket porting program which was developed over the last several years. Pocket porting removes excess OEM casting flash and the material underneath the valves. By smoothing and blending this area under the valve seat, significant flow capability can be achieved. The IAG Stage 2 pocket ported head package starts with brand new WRX OEM S20 head castings,
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