I have a diablosport tuner that's less than a year old which was used for my 2006 GMC 2500HD which had the 6.0 V8.. The tuner did help in power and mpg I consistently got 15 16 mpg. Anyhow the truck is gone and the tuner is returned to stock format so someone else can use it. I bought a new challenger so looking to sell this one to help buy a diablo for my new car. 200 shipped.