IAG 950 CNC Ported Race Cylinder Heads Package for 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT Include Chamber Modification (EJ20 Heads On 2.5L Block Only):No AEM Electronics X-Series Wideband AFR

AEM Electronics X-Series Wideband AFR Gauge wOBDII Connectivity Universal One of the most imperative insurance policies you can have on a turbocharged motor is having a quality wideband O2 sensor

Front endlinks are a consumable item

MR Technology Benefits: Substantial power gains while maintaining critical Air/Fuel (A/F) ratios

Year Make Model Submodel 2008-2021 Subaru STI All

IAG 950 CNC Ported Race Cylinder Heads Package for 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT Include Chamber Modification (EJ20 Heads On 2.5L Block Only):No AEM Electronics X-Series Wideband AFRIAG 950 CNC Ported Race Cylinder Heads Package 02 14 WRX 04 21 STI 04 13 FXT 05 09 LGT Full CNC Port Job for Race and High Horsepower Competition The IAG 950 Cylinder Head Package features complete CNC machining of both intake runners and the hard to reach exhaust dog leg ports by IAG's Centroid 5 axis CNC machine. The exhaust dog leg is notoriously difficult to port effectively by hand CNC machining is what makes consistent, repeatable results