IHI VF39 Series Turbocharger

The Subaru OEM IHI VF39 Series Turbocharger offers a direct bolt-on solution for enhancing the performance of 2002-2007 Subaru WRX and STI models. It represents a significant upgrade for 2.0L WRX owners seeking a substantial power increase, with the added benefit of compatibility with many engine management base maps, which can sometimes eliminate the need for custom tuning. For 2.5L WRX models (2006-2007), a VF series turbo upgrade will also yield improvements, though the gains may be less pronounced compared to the 2.0L engine due to a potential taper in high RPM power. STI owners should consider this turbocharger primarily as an OEM replacement. It is important to note that as with any turbo upgrade, this Subaru OEM VF series turbo will require complementary fueling and tuning upgrades to ensure safe and optimal operation. Specifically, the IHI VF39 features a P18 exhaust housing and a P18 thrust bearing setup, capable of achieving up to 285 wheel horsepower on the EJ20 engine. This turbo comes stock on the 2004-2006 US Market STI and is a proven upgrade for the WRX.