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Find a reputable speed shop a get a dyno tune, and check into the E-85 option. It may cost another 150-200, for E-85. You may want to check into Overkill tune. Will at Overkill does remote running with data logging and retunes for as long as you own your car. He also offers the E-85 option for 200. The data logging tune with unlimited retunes as long as you own your car is 500. You'll get between 15-25 rwhp gain with the tune. A tune with the E-85 option will get you close to 300rwhp or slightly over. These are your best performance gains option. Anything else, throttlebody, exhaust, downpipes, manifold porting and spacers will add 5-6 rwhp or less each. So it depends on what you want for your money,hp gains or better sounding exhaust?
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