It may go without saying but having a truck that's tuned up in good running order is a world of difference if say you had two or three weak injectors and don't know it. I tuned up a friends farm truck that had a reman inj pump, put four injectors in it turned the fuel up slightly not big smoke blowing turned up, adjusted the throttle position sensor back to where it should be, put a 3" exhaust on it and a new stock fuel transfer pump. He was extremely satisfied. As the slow degration of factory parts he didn't notice it until compared to after with good parts back on it. Not saying it was fast or anything just a lot more pleasant to drive.