IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 18-20 STI N25 Casting. 2014-subaru-impreza-wrx sti limited The gaskets are not recommended

The gaskets are not recommended for blocks or heads that are o-ringed

the output shaft breaks where the driveshaft yoke connects

thus reducing aeration Increased capacity and additional cooling fins to reduce oil temps

In the Centroid

Pocket porting removes excess OEM casting flash and the material underneath the valves

IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 18-20 STI N25 Casting. 2014-subaru-impreza-wrx sti limited The gaskets are not recommendedIAG Stage 1 Cylinder Head Package: IAG's Stage 1 cylinder heads are intended for those looking for a cost effective OEM+ replacement. Each package starts with brand new WRX STI N25 OEM head castings, directly from Subaru of America. The bare castings are visually inspected and then fixtured into our in house Centroid 5 axis CNC Machine. This is one of the most advanced pieces of precision engine machining equipment in the world. In the Centroid, the