I agree with Nasty Stang, L/T and SLP will sound like crap. An X pipe will make it sound even worse. There are a few other options. Keep the L/T and X and get stingers, bassani race or maganapacks; drop the x and buy an H pipe and get the fore-mentioned axlebacks or get a chambered design. If you want the SLP loudmouths, drop the L/T and X and just get the SLP LM, as they sound best with the stock headers and stock H pipe.