About 450RMS on a stock 65 amp alternator.Maybe a capacitor?A bigger alternater is no option so you better not tell me to get one.

take a multimeter and check the voltage on the battery with the stereo up-if its too low, check into an alternator

Nope.....I don't think so.

Yeah ur alternator could handle it easily im running 800rms...on 90 amp alternator..with 5 farad cap my sh*t still dims...but i have my gain and bass boost all the way up ((dont do this this is a bad influince, but i have my sh*t rigged))

You can safely go up to 550 watts RMS total.

yes 65 amps is enough for about 600 watts RMS