Cavalli Turbo designed this WRX/STI drop-in turbo in house from the ground up. They have applied their Patented Triplex Ceramic Ball Bearing Billet turbo technology to this Direct Replacement Drop-In Turbo.
They chose a 53mm inducer/56mm exducer for their Stage 2 application for enthusiasts who are looking for up to a 55% increase in power while maintaining as close to stock spool characteristics as possible.
It is recommended to use 850cc or 1000cc injectors for 91/93 octane and 1000cc for E85 applications. They utilize a Turbosmart wastegate actuator to help stabilize boost on this high boost application.
They do not recommend large diameter aftermarket exhaust manifolds/headers as a diameter over 1.25" drastically reduces exhaust energy and will move the power band to a normally less than desirable range for a street driven car.