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will i run into any problems (like blowing electrical things up) if i upgrade my alternator to a 120 or 140amp from my a e34 or something? thanks guys!!!

No, as long as the voltage regulator is functioning ok.

No problems, but why? The stock 65A is more than adequit for normal purposes.

If you don't plan to double or even triple the devices, which will consume 12 (14) V, for example an additional battery, real 1kW audio power amplifier or more, high power xenons and so on - it is unduly.
It will be better maybe, if you share your plans, then we can give more adequate advices.

I just plan on adding motronic 1.3 from a e34. With e34 intake ECU exhaust ETC

You can keep the more powerful alternator. I don't think it is much heavier, and that is about the only disadvantage I could think of.

kingoftarmac wrote:I just plan on adding motronic 1.3 from a e34. With e34 intake ECU exhaust ETC

A larger capacity alternator won't help but it won't hurt either. Technically you should upgrade the wiring from the alt to the battery but I doubt you will be getting that much out of it often enough to really need it.

the voltage regulator inside the alternator controls the output of the alternator based on load requirements. it will only put out the amps required to replace what your various loads are consuming, in order to maintain a constant voltage.