I will be converting over to v3 in the next few weeks. I am first going to dyno my car on v2.5 with the tune I have a 32psi. I will then switch to v3 and retune the car. Once I have the tune back where I want it I will again put the car on the dyno at 32psi still using the gm maf. Then its SD time and a retune and back on the dyno to see if the car picks up hp from going from v2.5 to v3 to v3SD.
I doubt you'll really see any HP gain from 2.5 to v3, but who knows.
I've had v3 since the DSMshootout... I'm going to give SD another shot today I think. I was beta testing it but other issues made me had to stop for the time.
I wouldn't think you'd get much peak hp difference since most people tune timing sliders to their highest boost level. You probably will get a better over-all tune though, primarily because of the full 2-D timing array.
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