This 3/4 truck spun the tires real easy on the street, And heath diesel said with some of there upgrades to the 6.5turbo, it can run with the stock Duramax.
And then BOOM! game over
I've never seen a 6.5 worth taking out.
The 4bt is neat, but limited on rpm. Heard rumors of cranked up ones, 500lbs of torque, but only like 140 horse. Probably redlines at 2200? They are pigs in the weight department also