An 08+ diesel truck isn't like a gas engine where you can slap an aftermarket wiring harness and ECM on it and tune it with on a laptop with whatever program you chose like HP Tuners. Well less than 1/4 of the people who modify these trucks for competition do the tuning themselves, cracking the ECM codes and altering the programming is very difficult on an 08+ diesel truck and only a handful of companies have done enough research and testing to be able to do that successfully.There are also no performance ECMs available for these trucks in the US because they would be Illegal to sell if they allowed for the removal of emissions. If you wan't to build an 08+ Diesel truck for competition use these days your only option for tuning is to buy from somewhere outside the US or go by word of mouth to find someone that will do it under the radar, and that is unacceptable in my book. Competition only use parts and tuning should be just as readily accessible for diesel engines as they are for gas engines.