Talked with the dealer and the alternator for my car is rated at 145 amps couldnt get any more details then that and honestly not sure what other details I would be looking for. not bad but looking at the current draw from the 2 amps with just the sub amps ur lookin at 240 to 320 amps of current draw even with an extra bat big 3 upgrade to be safe you might just have to bit the bullet and get a alternator upgrade with that much going on youll be diffentlly over working the stocker