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Yes. There could be some high rpm gains over the stock system, but I've read the stock exhaust flows pretty well. I think max hp/tq numbers won't budge, but 4500 to redline could see benefit. Then most exhausts see similar gains so sound and weight reduction are biggest benefit if there is little power gain.
I think AA claimed 18hp gain. I'd be surprised if that was max hp. I'd like to see the dyno from stock to aftermarket. I'm sure there is a 5-10hp error bar to consider.
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