I have a stock 2008 Dually with 26,000 miles. Just got it back this afternoon from the shop. Holy Crap does this thing Ripps now. We installed the H&S Mini Maxx tuner, cleaned out the cat and straight piped it out with 4" exhaust, and added an AFE cold air intake. We took our test ride in it and smoked the duals right off. Then we did a 15 mph roll and nailed it and still broke them loose. I'm not into beating on my vehicles so don't get me wrong but I did not expect the truck to do that. Now I hope the fuel economy goes up and I can do 65-70 mph up the mountains pulling my 39' toyhauler....

 

There is more! Belive me! There is more! That Duramax is capeable of doing quite well and get really good fuel economy! Better then the Dodges of the same year and most of the older ones! Enjoy that Truck!