Stock WS6 Muffler
#2
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About as good as the rest of the stock LS1 mufflers.
If you want to keep the stock muffler for the sound (or lack of sound), then get a cutout for better flow when you want the power.....
If you want to keep the stock muffler for the sound (or lack of sound), then get a cutout for better flow when you want the power.....
#3
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Mine sounds decent now that I've gutted the cats. If you're still stock, one of the best mods you can do for the $$ is get a cutout put on it. Or step up to an electric one, like a QTP.