this is a 2011 505 cummins power with ALL THE EMMISSION SYSTEM REMOVE, it has PDI software in computer, when system was removed we replaced turbo, manifold and exhaust elbows it has 10 speed with 336 rears, tripac apu with espar heater, truck averages 6.5 to 8 mpg, this truck has been set at 66 mph ,it has run the west coast and only the west coast for last 3years,pulling step deck freight, I have every oil change and every maintenance records, I HAVE 3 OF THESE UNITS FOR SALE miles in 590 range to 658000 milesCALL RICK 217 357 4018