Are we talking about an Hpipe from a GT and catback or just a catback? Either way you'll need some cutting and welding work done, as Venomouz831said. The work won't be difficult for an exhaust shop though. They should be able to do it in a few hours.
Apologies, i scanned a little bit to quickly. if you are talking about the stock exhaust system off a GT then no it won't and same with an aftermarket dual exhaust system. it will still need to be welded either way. Reason being that the v6 comes with a single exhaust along with a y pipe. Sorry guys didn't have my thinking cap on straight lol