Altenator power recommendation?

2150 watts times 1.33 (this allows for a 75% efficiency - probably high) equals 2860 watts IN divided by 14.4 equals 198 amps. You are not likely to be running even CLOSE to RMS for extended lengths of time, but there is the answer to your question.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Just remember a good battery can hold a 30 second discharge at 200amps and not drop below 10.5 volts. This of course will reduce your RMS since it falls well below the 12~14.4 volt rating. This is without the car running. A 130amp altenator can carry your system since most cars can not putout 14.4 volts with the rest of your electrical system needing some of it. Most will hold a steady 13.8 volts which drops your RMS output anyways. Also if you ever burn up a voltage regulator you will start burning thigs up. So upgrade your wiring to match your output at the Battery,  Altenator and sound system. And always fuse everything.