I have a 1999 Grand Prix gt 3800v6 can super charge it with out changing the cam or can I put a 99 supercharged Monte Carlo motor it ?
Addnig a super charger to a non supercharged car is a big deal. As well as the engine mods you will need to change the electronics and the fuel system (two stage fuel pump) and your non-heavy duty transmission will likely not be up to the task. You might be able to put the Monte Carlo engine in, but you will also need all the electronics, the fuel system and if possible the HD transmission that goes with it. Why not just buy a GTP and enjoy it. They are everywhere and are reasonably priced. Do minor mods to it to make it better if you want to and enjoy the reliability of a factory built car.
Search Pontiac Grand Prix Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Grand Prix Experts