IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves for 06-14 WRX 06-13 FXT 07-09 LGT D25 Casting (Cams / Lifters Sold Separately). 2016-subaru-wrx-sti along with other race-proven components

along with other race-proven components to complete the assembly

5L nitride treated STI crankshaft that is matched to ACL or King race main bearings

IAG's Stage 5 Cylinder Head Package utilizes a CNC porting program for the D25 heads that was developed over the past five years and tested on the most successful high-horsepower Subarus

GTIN: 00887753778376

IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves for 06-14 WRX 06-13 FXT 07-09 LGT D25 Casting (Cams / Lifters Sold Separately). 2016-subaru-wrx-sti along with other race-proven componentsIAG's Stage 4 Cylinder Head Package utilizes a CNC porting program for the D25 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 B25 STI Forester XT Legacy GT OEM 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