Magnaflow, I think APR does one, along with nuespeed. save some money though...I had a cat-back custom made for my B6 1.8t at a muffler shop with magnaflow mufflers, 2 1/2" piping same tubing that all the top name brands use for a little over $400. I noticed a little gain in power, expecially when the turbo kicks in. Has a nice low rumble, not too loud. Most are priced high and then you still have to install it, if you can get under your car and have tools then great but if not you got to take it somewhere to get it put on.