@Cheerfulpimp I was looking for the AFe turbo back exhaust, just to use the stock hangers and have it bolt on (Just in case I need to return to stock). I might be willing to cut it out and replace with a 3" straight, as long as I can return to stock if needed and it doesn't sag or rattle.
Did you do the EGR as well?
As for oil, I differ from a lot of folks and still really like the Dexos 2; mobil one's version at least. However, if I was to go with a full delete, shell rotella would be at the top of my list. Just from all the reading I have done on the 6.6 Duramax and Cummings. I like DeBoss Garage on youtube, who has engines that surpassed the 1 million mile mark, and he swears by Rotella and lucas upper cylinder lubricant. I don't have first hand experience but I believe the guy and think its worth considering.