what supercharger kit is a plug and play unit

OK guys, I'm a noob to the 1994-1996 Impala SS vehicles, I have been a Turbo Buick guy til now, so I'm looking for help on which units if any are a
plug and play system for our cars, I'm not looking for a large increase in
HP, a 100 or so increase would be nice so all help and info would greatly
be helpfull, thanks,

Ron