IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 07 STI V25 Casting. 2006-subaru-impreza-wrx sti and Oil Cooler (Sold Separately)

and Oil Cooler (Sold Separately) to complete their installation

The IAG Performance AOS (Air Oil Separator) pitch mount bracket is designed to replace the standard mounting bracket included with IAG's AOS kits

5" Hose Replaces the coolant line included with the V3 Air Oil Separator

Our latest bracket design relocates the alternator without requiring any modifications to the OEM bracketry or oil dip stick mounting for the EJ25

New Head Castings

IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 07 STI V25 Casting. 2006-subaru-impreza-wrx sti and Oil Cooler (Sold Separately)IAG Stage 1 Cylinder Head Package with GSC Stage 1 Cams: IAG's Stage 1 cylinder heads are intended for those looking for a cost effective OEM+ replacement. Each package starts with brand new WRX V25 STI 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.