Xcal3 Questions

[raptordrew]

So after reading through the forums (and on some other forums), I've come up with a few questions I wanted to ask before I drop $400 on one...

1) Does the tuner need to stay hooked up to the car? I was on another (less informative) forum for Tauruses (wife's car), and they kind of made it sound like you had to keep the tuner hooked up for some reason.

2) Can I not use one tuner with multiple cars? I.e., once I flash my Focus, can I use it on my wife's Taurus? I'm guessing this one's a no, from what I've read, you have to send it back in for an ECU code change whenever you want to use with another car. If you ARE able to, do you have to revert the tune on the first car before tuning a second?

3) Do I need to revert to OEM flash before doing emissions? I'm in Atlanta; car will have very few NA mods, so it's mostly a tune to improve MPG and driveability.

Thanks in advance!