ok so i know you can get a saab altenrator to fit on the mercedes .. but my question is will it hurt anything if i put a 120 amp alt on my car ? what if i even went up to a 150 amp alt ? reason is my car stereo pulls allot of juice and i need the extra for it .. but im afraid of frying something .. i dont always have the stereo blasting away so would all the extra amps be harmful ?

my car is a 300 se 1988 3.0L