Part two of our series forced us to tackle a job many 7.3L Power Stroke owners dread: replacing the exhaust manifold up-pipes. While it’s not a fun process, it’s a necessary one as these engines age.

The term “dyno-proven” has a nice ring to it, doesn’t it? Dyno testing has a way of determining whether or not certain combinations of parts work, and it allows you to simulate how a truck will ...