Alternator Swap
 

First of all, I'm hoping that this is in the right section...

I am looking at a new Alternator to squeeze soem more juice/life out of my battery. I am looking at this bad boy ACDELCO Part # 3342529A to do just that. This one (RPO Code KW1) lives on 96+ Astro Vans, Tahoes, Silverados, Avalanches, and a handful of other stuff.

I currently have all new speakers, subs, head unit, and an amp drinking sweet, sweet energy. In the near future, I plan a second amp (sub only) and auxiliary lighting (4 front, 2 rear) and believe this will put a bit more stress on the 100 amp I am currently running.
From time to time when I'm listening to music and exercising the accelerator, I will get a Check Bat. Light (and chime!) until I let up and it can keep up with the needed charge.

I am not a competition sound rig, i have no idea how to run 2 alternators, and a capacitor wont help when I'm running trail lights. Will this 145 Amp Alternator do what i need it to (get me more juice) and will it fit. Also, will I have to change out to a 56mm pulley (or larger) with this thing? BTW I have and am currently Google-ing this very topic with little success.

Any help is appreciated.

Really? No one has put a bigger Alternator in?