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Bigger than the GT28, ATP's GT3071R has slower spool, but will handle up to 450 crank horsepower on the Mazdaspeed3. This is efficient up to 22psi and a great choice for those that don't mind adding a bit more lag for exchange for more top-end performance. The GT3071R is simply the fastest spooling turbo on the market if you are looking to make power in excess of 450 horsepower.