Both mufflers mentioned are great...I have the Goerlich Xlerators in the trans am and eliminated a nasty drone between 2200-2500 that had existed with the spin tech crap mufflers that were on it. Not to mention they flow MUCH better. My Grand Prix is getting a set of the Dynomax's mentioned though...managed to pck up a pair that had been used a few weeks for almost half price. Goerlich is an OEM manufacturer and they are quiet. Just so happens they perform too. Dont think the tips will make any difference.
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