Basically, the Duramaximizer increase rail fuel pressure by turning a knob. It is considered older technology and was one of the first products for the Duramax to gain power. Some like to use it with programmers or tuners to get more power.
Programmers and tuner (Edge Box) change the the software commands controlling the fuel injectors, tubro, etc. Primarily, they get more power by changing the timing, duration and fuel volume injected by the electronic fuel injectors.
Kennedy Diesel has a good write-up on their web site describing the different approaches to getting more power.
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