I disagree -- the bigger injectors from TVT made a big difference for me -- I had the tune, the intake, and the Magnaflow catback exhaust already, the injectors were the final piece of the puzzle!!! Much more power, smoother and pulling hard all the way to redline. I mix some 100 octane race gas in (Phoenix has lousy gas, supposedly 91 octane but 3 or 4 gallons mixed makes a big difference -- use half and half for track days).