Picking cat back exhaust

I want to get an aftermarket cat back exhaust for my 2002 mustang gt, but I don't want that much noise. I'm picking between Flowmaster and SR Performance. I can get a SR new for $305 or get a used Flowmaster for $400. They both sound good but maybe is the quality that makes the price difference. I don't know much about exhausts but the Flowmasters look a little beat up. Just trying to get some thoughts and opinions