You would gain on both, sound and HP. You would get a bit more hp if you just put a straight pipe. I put on high flow cats on mine, and noticed good power gains.
I removed the cats and replaced them with resonators and borla mufflers with dynomax noise reduction cones. End result - much cooler sills, good sound without being obnoxiously loud on a side exhaust car. Car makes 629 rwhp with roe supercharger.
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