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I'm supercharged, running a full custom 2.5 exhaust...UEL header, high flow cat in front pipe, 1 resonator, cutout valve, another resonator, then the stock muffler. It's quiet, unless I crack open the valve.
As for performance/restriction, there was only a 5hp difference on the dyno when it was run with the cutout valve wide open (no muffler) and with it closed.
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