I just got off the phone with GM Performance Parts:
The stock number for the Vibe's Supercharger is:
Retail approx $3000.00 (US)
Dealer anticipates 4-8 hrs labor for install.
***Remember: this is only for the BASE VIBE. It won't be installed (and/or warranted) for the VIBE AWD or GT***
Looks like it's a 30% increase in hp (up from 130 to 169-170hp)
and only a 18% increase in torque (up from 125 to 149-150lb-ft)
Sounds like plenty of scoot for a 2700lb car!
Just remember to get the 5 speed!