Installed a 4/5 DJM kit last week, on my 2011 Ext Cab. I would only do this mod if you have lots of smooth roads. Looks great and rides very good on decent roads. On really bad roads the rear hits the bump stops and the front bottoms out on the fender liner. The flat part of the tread hits the top of the liner. The roads are pretty good around here so, lucky only to bottom out a couple of times a day. I have coil overs coming to fix the front. If I can raise it a 1/2 inch it won't hit. The rears rarely hit the bump stops.