This Cummins is the first one we got and it has over 350,000 miles (can't tell you the exact number cause the mileage meter quit workin like two years ago) on it and we work it everyday. We have had the transmission rebuilt once and it has a reconditioned engine in it. The pump has been turned up about 45 or so horses for a little extra power for pulling the heavy loads around the farm and for some smoke. Exhaust is a 3" staright pipe. Its just a farm truck that has been through everything and we've had the frame redone from the middle of underneath the cab back with 7 inch bus frame and the cross members and leave spring brackets made out of 5/16 inch steel..and this one runs on biodiesel too.