You are referring to the alternator, right? I have seen 105 Amp on the board, but I am not sure.

 

As far as speakers, the door speakers I pulled out of my 92 the other day were rated for 15 watts. Being you have a '99 though, it might be different.

 

I was thinking he was wondering what the stock RMS was on the factory amp (the amp is tiny, so it is probably not much). I would just suggest that you get an entirely new stereo system. It will sound much better than the factory infinity system.