What's the diff? I was reading about it at VMP's site, but really still couldn't distinguish between the two. I have an '08 F150 5.4L 4x4, Maggie 16616, and will be getting an AF1 3.5" intake soon. does it matter if you run Xcal 2 or 3?

 

I believe the X3 comes with canned tunes, the X2 doesnt.

 

Xcal3 will hold 3 custom tunes and 3 canned tunes, the xcal2 will only hold 3 tunes. The xcal3 if im correct will also do better data logging. But a custom tune is a custom tune and will be the same in any xcal.

 

Your going to need a custom tune to run that 3.5" AF1.