so im looking at summit racing, and they have a lot of flowmaster catbacks but i dont know which one id need (a lot of them are called the same thing, and under 'fitment' most of them say cobra , gt, lx, etc... im a little lost.

also, would it better to get (this is while looking at v6mustangstuff) something like this:
and use the existing cats and whatnot, or is that a bad idea. would that peice bolt up to a flowmaster catback ok?

 

i guess ill have to wait till after the holiday to get any more info [8D]