ponyverde

How much horse power do you gain by adding a sct x3 flash tuner and whats the differance between the two.

Diabolical!

None. The two what?

Nuke

Yeah. The 2 what? If you mean a difference between the tuners, none. They're simply the hardware required to load a tune. A HP difference would be attributed to the QUALITY of the tune (whomever wrote the new tune and how aggressive it is). For example, tunes from companies like American Muscle, SCT, Diablosport, FRPP are typically mild compared to those from Brenspeed, BamaChips and VMP.

2007VistaBlueGT

Yes, If you mean that you have Xcal 2 and want to know the advantage horsepower wise going to a 3..... none.