The Perrin rotated mount turbocharger kit is one of the most comprehensive and best-designed on the market. The Perrin rotated mount turbo kit utilizes redesigned exhaust and intake plumbing to install a large Garrett Turbocharger on your WRX or STi, without being limited by the stock under-the-manifold turbo inlet and internal wastegate. Perrin's rotated turbo placement allows for straight, unobstructed intake plumbing and fitment of even the biggest turbochargers, like the Garrett GT40R!