Quote:
Originally Posted by Rabamaro
Correct me if im wrong, but I'm not totally sure that you'll gain any power with opening cutouts. If anything, you'd lose some torque. I think they're purely for sound. There really isn't any restriction at the mufflers. An aftermarket axle back might net you 2-4 rwhp. A cat-back only 6-12 hp. Most of the restriction comes at the stock exhaust manifold and cats.
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he will gain a lot of power if he adds headers regardless of cut outs or not.