IHI turbos are a direct bolt-on for the 97+ WRX and STi utilizing the factory mounting points and attaching to the factory oil and coolant lines. 

The IHI VF-22 turbo is the largest of the VF-series turbos. With its significantly increased turbine housing, the VF22 turbo is capable of producing upwards of 210kw atw on an EJ20 with the right supporting mods. The downside of this turbo is the older center cartridge design and larger compressor housing, which makes for slower spool up but more top-end than the other VF series turbos. A popular choice for big power street driven 2ltr cars, it's also a proven performer on the track.