The GT3076R is efficient up to 26 psi on the MS3 2.3L turbo engine and can produce over 500 crank horsepower when configured with proper supporting mods and tuning. This is a great spooling turbo and is the benchmark for building a 500 horsepower Mazdaspeed3. You can expect this turbo to spool around 500 RPMs later than the GT3071R on the same 2.3L engine.