single chamber magna flow exhaust???

[TXSVT1]

okay guys so here's the deal. I have a friend that's selling a single chamber magna flow catback exhaust with a internal x-pipe. It's like the one on lightning force performance that's going for 499. Now I have the dual chamber magna flow catback exhaust with the external x-pipe. Now my question is which is better and has anybody heard about this single chamber magna flow catback exhaust with an internal x-pipe??????