[Pikachoo]

The only supercharger for the 2.8 and 3.1l cavaliers is made by these guys.. and it's expensive as crap!!
http://www.raceshop2000.com/

For a turbo setup your only option(easy option that is) is to find a 1989-1990 TURBO GRAND PRIX, and swap motors. The swap is fairly straightforward, and can be done by most any able bodied backyard mechanic. You can usually pickup the motor/turbo/computer/and everything else you need from a junkyard for around $800, rebuild the motor $400, and have yourself a turbo cavalier!! :smoka: For more info on the swap check out Curtis Walkers website. He was one of the first guys to do the swap, and after lots of work I think he's running mid 13's at the track!!

http://www.turboz24.com/