This is my 2006 LBZ Duramax. I really haven't had to do a whole lot of modding because mostly everything on my truck is still running as strong as the day I bought it. Most of the work I've done has been to make it look great and change some of the aspects of its drivability. Altogether I've installed a 6-inch lift, and I then changed the wheels to 20-inch MKW Wheels wrapped with 35-inch Toyo MTs. On the performance specific side, I put in an Edge Juice with attitude chip, aFe cold air intake and a 5-inch down pipe back exhaust. Like I said my Duramax runs powerfully and comfortably, so I haven't had to spend a lot on repairs or upgrades.