Quote:
Originally Posted by RabbitZL1
Up to a certain point. I myself tested this. Gained exactly 2mph at the track. Didnt totally eliminate the muffler, only added cutouts before the muffler. The muffler itself I would say up to 900 there has no major effect on hp. I was told by Justin Keith that he lost 3mph from replacing the oem muffler with aftermarket mufflers. (air caught under the rear bumper). He goes 9.50s.
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what do you mean by cutouts? thanks