i have my two 15" L7's hooked up to a PPI DCX 1500.1 and its killing my stock alt. I found a 150 amp HO alternator for like $280. Is this large enough or should I upgrade a little more. I have a long drive to work and i pound the hell out of these spaeakers so i want to make sure i have enough juice. by the way, my stock alt. is 105 amps if that will help. any advice.