It's loads of fun, severe power delivery in low RPM's though, more so than my old VAGs or Subaru.
1. Yes
2. It's not really set out this way, more so...
Stage 0 is COBB's interpretation of stock
Stage 1 is set into Drive, Sport & Aggressive, boost pressure increases in each map in this order. Then you can choose Linear or Stock Throttle, Libear being progressive and Stock Throttle being high boost low down in the revs. No mods required.
Stage 2 is air filter and down pipes. Same options as Stage 1.
Stage 2+ is as Stage 2 but with FMIC needed. Same options again.
Valet is well, Valet
. Limited to 4000rpm.
3. No, locked to one car at a time.
I hope that helps!