Alternator and battery

Hey guys, I drive Audi 80 2.0 E 115 hp from 1990. The question is, what amperes number has the alternator? I know, actually it should be on it but I find nothing. I have a sound system in it with power amplifier heckboxes from Hifonics Zeus and ne bass box from mac audio, and frontboxes directly on the DVD radio with display…. I also have condenser in it from HIFONICS. Only the system consumes somehow so much current that I am constantly afraid of the car I can no longer start when ic I know there is either 65 or 90 amps Lima, I have a 65 amps battery in it, but I’m still not sure. If I should have a 65 amps Lima, could I also make a larger battery in it? How much bigger? I hope you can help me. MfG