I was looking at exhaust stuff on ebay and ran across a vender selling dual exhaust systems. You can get different mufflers, different tips, etc. It looks like they give you a name brand muffler and some kind of generic tailpipes, hangers, hardware. Just wondering if anyone has tried this stuff. Is it decent quality? I figure it can't be any worse than some of the "custom" muffler shop jobs I've seen. Just looking for some input, they're still not exactly cheap..