I have an 04 FLHTCU and bought it with a SuperTrapp 2 into 1 system. It's a bit louder than I'd like and I know I can take a disc or so out to quiet it down. What I'd really like to do is swap it out for a true dual exhaust. Here are my questions. What true dual is a good system for the $? Is my current system worth anything used? Would Ebay be a logical site to sell it?