this is what i got in a g35, i believe stock alt is 90 amps: xenon 100x2 zed deuce 800x1  rl-p d2 in 1.35 sealed box.  finally installed my rl-p d2.  and i just love the way it sounds.   problem is... when i turn the volume halfway to where i want, my lights starts dimming already.  i'm like wtf!  my '91 mazda minivan had a better charging system!   i may have overshot a little by buying the zed deuce, but i didn't think it would be this bad.  i'm so pissed i bought all this chit and can't even use it to its potential.   i've read that replacing the big 3 will help...but how much really?  i'm thinking of maybe porting...or worse, having to go with another brand that's more efficient. or maybe it's the amp that's inefficient.....i dunno.  any suggestions?