I just installed my CorkSport Drift Cat Back a couple weeks ago. I love the exhaust. It pops, burbles, and sounds amazing through tunnles. It's also extremely lightweight and comes with a new cat exhaust gasket, poly hangers, a silencer and hardware. I've put the silencer in once since owning it and it was very mellow. It has also quited down a bit during break-in and sounds even better than when I first installed it.
After installing the exhaust with my dad, I had a clearance issue due to how I installed the exhaust clamp (I didn't know this at the time). I called them up to see if they could help diagnose the clearance problem I had, and they not only offered to help me over the phone, but also offered to put my car up on their lift and adjust it for me. I brought it in the next day and they adjusted it free of charge. Very happy with their service.
Here's a couple photos: