The factory up-pipes in your 7.3L Ford Powerstroke sees extreme heat cycles that can damage the up-pipes. This excessive heat causes expansion and contraction of the factory donut gasket creating leaks. When this happens, engine power can be reduced drastically. These upgraded up pipes eliminate the troublesome "donut" gaskets and replace them with durable steel crush gaskets that will not blow out or leak over time. The up-pipes feature a bellowed design that allows for expansion and contraction without need to rely on a factory gasket.