Welcome to the forum! There are many different variations of modified 3800's on here. Some stock M90, some bigger superchargers, some turbo, some nitrous, and some pretty powerful N/As as well! Personally I'm currently building up my suspension and ripping my spare transmission to pieces to supprt my future path which is still uncertain. I'm stuck between going the distance for a turbo build, or keeping the stock m90 and going with the XPZ cam, or keeping the stock m90 and going with the XP cam and a shot of N2O!
Either way you can get a decent amount of initial power out of your car with an intake, headers and downpipe. As you gain supporting mods you can start lowering your pulley size but you want to tune your car while doing all of this. It is very important.
Also to keep in mind, our transmissions tend to break down when we start adding more stress to them. It is almost essential that you have it beefed up when you start getting into the 300hp range. Also, if you put bigger rims on your car it too adds stress to your trans.
