IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves for 02-05 WRX 2.0L S20 w/ Chamber Matching(Cams / Lifters Sold Separately). 2020-subaru-wrx sti-sti During final assembly

During final assembly

IAG Magnum Subaru EJ25 Closed Deck Short Block The IAG Magnum Short Block starts with brand new Subaru 2

Prothane Subaru STI Front Control Arm Bushings - Black

IAG-Spec H-Beam connecting rods and ARP rod bolts are utilized along with ACL or King race rod bearings

The block is then paired up with our Stage 4 Fully CNC Ported Cylinder Heads to deliver maximum flow for high hp applications

IAG Stage 4 CNC Ported Heads w/ +1mm GSC Valves for 02-05 WRX 2.0L S20 w/ Chamber Matching(Cams / Lifters Sold Separately). 2020-subaru-wrx sti-sti During final assemblyIAG Stage 4 CNC Ported Heads with +1mm GSC Valves: 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 OEM 2. 0L 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,