IAG Performance V3 Street Series Air / Oil Separator (AOS) for 2006-07 Subaru Impreza WRX & 2004-07 STI. 2006-subaru-legacy-gt spec b The copper exhaust nuts are

The copper exhaust nuts are designed to replace the OEM exhaust nuts at the Subaru manifold to cylinder head location

This transfer gear set is 1

The IAG AOS conversion kit for the 2015-20 Subaru WRX FA20 DIT engine is designed to switch the upper breather portion of the Street Series AOS to the Competition Series AOS

the heads are reassembled using GSC Single Valve Springs and Titanium Retainers along with GSC Viton stem seals

Aggressive engagement

IAG Performance V3 Street Series Air / Oil Separator (AOS) for 2006-07 Subaru Impreza WRX & 2004-07 STI. 2006-subaru-legacy-gt spec b The copper exhaust nuts areIAG V3 Street Series AOS (Red) The IAG Performance V3 Street Series Air Oil separator (AOS) is an excellent investment to keep your Subaru vehicle running well. The Street Series AOS maintains OEM PCV system functionality, but supplements its capacity. The Street Series AOS design is based on years of extensive testing on standard and competition applications. The Street Series AOS' large, 1 liter, cast aluminum swirl pot canister more effectively