Although 105amps are alot compaired to other cars, it doesnt seem to keep my battery charged with a small sony amp and two sony 12" woofers. I dont even play it that loud.
Also thinking about an underdrive pulley that will slow down my alternator so I need the extra power.-thanks

You can check this link out, but if you are not charging your battery, you might want to have your system tested, just to be sure. You could have a bad alternator or battery. Possibly caused by running the amp while at low idle.

http://www.afterthoughtsauto.com/higoutal160a.html