Hello!! I am new on here as well as new to the diesel world. I just bought a 2007 GMC 2500hd 4X4 LWB with the LMM Duramax. I have only 1000 miles on it now. I want to start building more power out of it. I have been in the truck seen for a while as my last truck was a 2002 GMC 2500hd 4X4 SWB with many mods. Heads, cam, headers, intake, full exaust, as well as a custom tune. Any advise on what to ad and when to and to the new truck? So far I have Nfab step bars, billet grill, and 32" Cooper ST.