Finally, a range of high performance direct replacement turbochargers that have been specifically designed for the Subaru WRX/STI by the Subaru performance specialists - APS.

APS has designed and produced what is arguably the ultimate in bullet proof turbochargers for the Subaru Impreza enthusiast.

Unencumbered by the limitations of current off the shelf WRX turbochargers, APS has totally engineered a "no-compromise" series of turbochargers from the ground up to match the exact requirements of high performance Subaru Impreza engines.

High strength compressor wheel design, ball bearing construction and high nickel content turbine housing means complete reliability to pressure ratios over 3:1 (30 psi!). And since nobody likes to wait, the APS S/R Series turbochargers are designed for fast spool-up to provide crisp turbocharger response.

Best of all, the S/R range of turbochargers are complete bolt on. Simple hook up of all factory connections and full compatibility with high performance inlet/exhaust means that the installation of your APS S/R Series turbocharger is truly no hassle.

If you want ballistic power and outstanding turbocharger reliability in a truly bolt on high performance unit, then the APS S/R Series turbocharger the perfect choice.

Available in a range of 3 turbocharger power output sizes to over 550 hp (410 kW), APS provides an S/R Series turbocharger that is optimum for engines from mild 2.0L through to wild 2.5L. The APS S/R Series Turbochargers are complete with all ancillary equipment for a truly bolt-on performance upgrade to the Subaru WRX/STI.

The SR40 turbocharger is a specialist performance turbocharger with performance characteristics to suit modified WRX engines of 2.0 - 2.2 L capacity. The SR40 turbocharger has the capacity to supply air to produce 440 hp with good turbocharger response characteristics.