I would be a little hesitant switching to the 4.8 tips. I have a 2007 4.8 and the black powder coating inside the tips starting wearing off. The dealers in Atlanta thought up all kinds of excuses before one of them agreed to "scrape off" all the powder coating. None would agree to replace the tips because to do so would involve replacing the entire muffler etc (b/c of welding). While this issue appears to be isolated it is not uncommon. Ironically, the tips now look better than the originials (stainless vs. black powder coat).