Im in the market to buy an X-pipe for my 2003 Mustang GT, right now I have a Magnaflow Magnapack catback system and I am interested in the Mangaflow off-road x-pipe, but I was wondering whether or not to get the x-pipe with or without converters? The prices for the two seem to be relavtively the same so can anyone tell me the pros and cons of each, e.g. which will make the most power? will they sound different? If anyone has any information I'd appreciate it.