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I just put a Borla S-type cat back along with Kooks headers on my 2011 SS Vert and I love the combo. It is honestly a little quieter when you are at idle but as soon as you hit the gas it had that nice deep growl. As far as drone goes, it does drone a little but I think it is the combo of the headers and it being a convertible. The drone is nothing like it was with my flowmaster set up though. As was posted before I think the DOD has a lot to do with the drone, but again it is not bad at all.
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