I love my Stillen kit and it's a blast to drive but I was never trying to hit a number. I wanted to give the car more power and I am thrilled with it now that the Stillen tune is off of it. I don't think you will like the kit if your goal is 550whp because the kit isn't designed to get you there. I know others have been told different but Stillen told me 500 hp at the motor not the wheels.
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