You dont say what year. but... Yes Pacesetters long tubes will not hang below the frame. But you will have to make a custom Y pipe like you have to do anyway with the stock exhaust. You can look at the performance trucks forum too. They have lots of pics of exhaust set ups when you search.
http://www.performancetrucks.net/forums/ http://www.performancetrucks.net/forums/forumdisplay.php?f=21 Good Luck.