Actually, mine uses a clamp...
Those are a few different things about our setups.. the connections to the cats, the color (sometimes) Mine's black like yours.. and the tip.. you have a straight tip that's pre welded.. mine's angled and has to be clamped on, which I'm going to have welded in a little bit..
I love it, although I wish it were a little bit louder.. but either way.. way better than stock! =D