if you arent even clipping yet, you are not even anywhere close to half the potential of your current amp. Like i said in many past threads to a lot of others, you can even run a 100,000 rms amp on a stock electrical system with no issues as long as you adjust the gain and output to where you maintain 12 ish volts. But you are definitely only getting whatever power your batts and alts can get you, if you clamped your system, i doubt you'll get any real numbers. This is not to put you down, it just means anytime you add another battery or alt, your sh*ts gonna get louder so thats the bright side.