FABRICE COFFRINI/AFP/Getty Images The twin-turbo system of a Nissan GT-R. See a close-up of the Mitsubishi Lancer Evolution IX's turbo system next. Up Next Will new motor mounts increase engine response? How does engine placement affect handling? Do exhaust cutouts increase horsepower? How much horsepower does a cold air intake add? How much horsepower does a performance muffler add?