Hey I just bought a 2001 GT auto last night. It has BBK O/R X and American Thunder exhaust. I want to tone it down a little bit so I don't get too much unwanted attention - would I be better off going to a catted mid pipe or trading out the 40 series mufflers? I don't mind the Flowmaster sound but the drone on the highway sucks with this setup. There is no emissions testing in my state. Thanks in advance!