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Originally Posted by gamefoo21
I was reading up and ford said that bolting on a second pipe was good for 20 more hp. Is there any sense in going with higher quality flowmasters? I don't want to go with straight pipes but I don't want to put on super restrictive pipes. I'd like something thats quiet and low restriction.
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Allthough some people will not believe\agree with me,Dual Flowmaster's have been shown to give about a 10-15RWHP increase over stock mufflers,and they dont have that lame ass Ricer sound most low restriction mufflers have.Then if you want to free up even more HP with less restriction you can eather gut the cats,or remove the entire cat\pipe and install test pipes which will give you more of a HP gain than gutting the cats.