DOS Performance 70 Turbo - 2002-2007 Subaru WRX / 2004-2021 Subaru STI / 2004-2008 Subaru Forester XT

Stock Location Power, Rotated-Setup Flow The DOS Performance 70 Turbo is built for EJ-platform Subaru owners who want serious power without giving up the drivability of a stock location setup. Rated to flow 70 lbs per minute and support up to 700 hp, the DOS 70 delivers boost characteristics that feel familiar off idle and pull hard all the way to redline. It was co-developed with Blouch Performance Turbo, one of the most respected names in forced induction for the EJ platform, and the result is a turbo that performs like it was engineered specifically for your car. Because it was. Engineering Built Around the EJ Platform The DOS 70 uses a 58mm compressor wheel designed to operate at high pressure ratios and high shaft speeds. This is not a generic billet wheel. it was spec'd specifically to outflow any stock location turbo on the EJ platform while maintaining the spool characteristics Subaru owners expect. The turbine side runs a 60mm exducer inconel 713c wheel, an alloy chosen for its combination of low mass and high temperature durability. The 0.73 A/R exhaust housing was selected to balance spool speed with top-end flow, and the result is a turbo that responds quickly without sacrificing power potential at higher RPM. Ceramic Ball Bearing Center Section The center rotating assembly runs dual ceramic ball bearings with metal cages. Compared to traditional journal bearings, this setup reduces friction at startup, speeds up spool, and extends bearing life under sustained high-boost conditions. Metal-caged ceramic bearings are also more resistant to the heat cycling and oil contamination that shortened the life of older turbo designs. The DOS 70 is built to last in a daily-driven high-performance application, not just on the dyno. Altitude-Ready Efficiency The DOS 70 was designed with altitude performance as a primary engineering objective. Its compressor map covers a wide range of air density conditions, meaning the turbo performs consistently whether you are at sea level or several thousand feet up. For Subaru owners in the Rocky Mountain region or anyone who regularly drives at elevation, this matters. Most turbos that are optimized for peak sea-level power fall off noticeably at altitude. The DOS 70 does not. Key Specifications Flow rating: 70 lbs/min Power support: up to 700 hp Compressor wheel: 58mm, high pressure ratio design Turbine wheel: 60mm exducer, inconel 713c alloy Exhaust housing: 0.73 A/R Bearing type: dual ceramic ball bearings, metal caged Co-developed with Blouch Performance Turbo Fitment: 2002-2007 Subaru WRX, 2004-2021 Subaru STI, 2004-2008 Subaru Forester XT Stock location direct replacement Straight From Subispeed The DOS 70 sits in a spot that is genuinely hard to fill on the EJ platform. There are plenty of turbos that spool fast, and plenty that make big power, but finding one that does both in a stock location is a short list. DOS Performance built this in collaboration with Blouch specifically because that gap existed, and the spec sheet backs it up. If you are building a 500-700 hp EJ street car and want to keep the turbo in the stock location, this is the one we point people to.