Modules vs Tuners??
We have been seeing some pretty nice performance gains from the SC OBDII tuners on the 24 valvers. We have only sold approx 30 of them but the customers have been real impressed as a whole. The install and diagnostics , tire size control etc is very important to some folks and not to others so I would make my decision based on what you need as a truck owner. The EZ tends to make more HP lower in the rpm range as an average, remember no two trucks will be identical and that's some of the reason you see some folks loving it and others saying it's just OK etc. Because they make lower rpm Hp they also tend to have a little less EGT, stands to reason as well. There is a cost difference too, but it's not the only reason to make a choice, pick the one that fits your needs etc.
Mark @ DPPI