Technically you could also run AIC or Reflex standalone, but then you're limited on tuners (Marin, only, I believe), Jeff won't touch it, can't speak for @visconti
Ideally, it would integrate through the factory ECU with Motiv's Reflex I/O controller. You're getting into expensive territory here. For the best Reflex integration, you'll need to retune with Ecutek.
Ecutek, Reflex, Port, Flex Sensor, Pure -> 600hp/600tq. Further than that you'll need a trans.
Questionable. The front jump point is a.. well, jump point. It has the full power from the battery. Either way. Can we get some photos of the trunk area to see if we can help you fix this up?
Could you give a little more detail on the Sport Cat? I'm wondering if you're having a little bit of trouble with a restriction there. I'd expect more as well.
They do, they're plotted with axle speed and reusing the Y-axis. Torque is also displayed in nm, which is yet another conversion you need to do.
Edit: He even explains this in the second half of the video.