It basically depends on what you are looking for. Some vendors sell it with high power tunes, some sell it with tow tunes and others sell with no tunes. It's definately worth buying from a Dieselplace supporting vendor vs another due to the support you get from them on and off of this site.
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!