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Hello,I have a 2006 mazdaspeed6,fully built engine. The turbo is garrett GTX3582 gen II with a T3 0.82A/r twin scroll turbine housing.So I used dual 38mm external wastegates dumped to air.About 3900 rpm it hit rated boost to 15psi,but after 5000 rpm and the wastegates completely opened, the car...