you'll also hear different terms for the "exhaust" either ...

"cat back" which replaces the piping and muffler from the cat converter all the way to the back.

and

"axel back" which is basically a short portion of piping and the exhaust can. it runs from the rear axel to the back.

both have their benefits, but you want your car to have the largest diameter piping. on an accord V6, most people go with the comptech axel back system. the stock piping is already at 3 inches and most aftermarket cat backs are 2.5 inches.