Aftermarket Cats???

Hey guys. I have a stock '03 GT (except for the CAI). I've been thinking about getting some aftermarket cats; either Bassani BX46995, or Flowmaster American Thunder. I've heard some people say that they would be too loud and obnoxious, while the guy at the exhaust shop said that since my car has 4 catalytic converters, that it wouldnt be. What I want to know is have any of you gotten any complaints about your aftermarket exhaust? Any trouble from cops?:shrug:
 
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