And what does any of the aforementioned performance mods...the ECU only or the different stages of Renntech performance, do to the factory warranty?

Also, to the emissions? In my state all cars are dynoed and sniffed @ 2 years by the state.

Maybe I'll drop 3 grand on a driving school. Will not only make my Crossfire go faster than it would if I dropped $10K on a Renntech mod, but it will make ALL my cars go faster too!