Bought a new 2011 Duramax a few months ago, and like my other 2 duramax's I would like more power that stock. Dont want to start cuting exhaust off, and dont want to pour the fuel on hard with programers ( and regen like crazy ). I started looking into water/meth as an DPF friendly approach. Has anyone done this on an 11? With the urea injection and o2 sensor(s), DPF, 9th injector in exhaust..... Is water/meth going to make it though all the exhaust Bullsh#$ without thowing codes or worse?