[piecesparts]

Actually the H pipe and the X pipe both will change the amount of torque developed by the engine, by assisting in evacuating the exhaust gases from the cylinders better. The sound is another plus, the truck will not sound like a tractor working in a field, it will smooth the sound out. The X-pipe is the most efficient of the two choices, but I personally would not put the exhaust in without one or the other being in the system. For my gas money, I want every dime to make some kind of power and the fact that the cylinders are not being swept clean effectively, during driving, would be wasting my money.

The exhaust is all about cleaning the cylinders and not creating a reversionary pulse that would hender the movement of gases through the engine.