IAG Stage 2 Pocket Ported Cylinder Heads for 08-17 STI W25 Casting (Cams / Lifters Sold Separately). 2021-subaru-wrx sti-base The IAG MAF (Mass Air

The IAG MAF (Mass Air Flow Sensor) mounting flange is manufactured from aluminum and is designed to be welded onto a custom 3" aluminum pipe

Killer B and OEM oil pickup

(EJ20 requires dipstick modifications)

0 Valve Guide and Seat Machine to match GSC's +1mm intake and exhaust valves

GTIN: 00887753777737

IAG Stage 2 Pocket Ported Cylinder Heads for 08-17 STI W25 Casting (Cams / Lifters Sold Separately). 2021-subaru-wrx sti-base The IAG MAF (Mass AirIAG Stage 2 Pocket Port Cylinder Head Package: The head package centers around our popular CNC pocket porting program which was developed over the last several years. Pocket porting removes excess OEM casting flash and the material underneath the valves. By smoothing and blending this area under the valve seat, significant flow capability can be achieved. The IAG Stage 2 pocket ported head package starts with brand new WRX STI OEM W25 head castings,