borla xp pro or magnaflow (not magnapak). You can also use a cherry bomb glasspack in front of them to help mellow the sound. In that configuration you replace the flowtubes with the cherry bombs. Should deepen the WOT note too.
Dynamat is the bomb for cutting the nut shaking resonance.
I had dumped flows on a catted bassani X and it just flat hurt around 1400-2200rpm. My borlas are great and still have a nice sound.
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