If you have the GT500s, why not just remove the resonators and see how you like that? If it's not enough, you can take it from that point.
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2013 Cadillac ATS Performance, 3.6L
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Formerly:
2012 GT Automatic, Kona Blue w/Stone interior
The usual exhaust mods, JLT CAI, Brenspeed tune, BMR LCAs
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