Snap. Perfect. I was running the Hifonics Colossus amp so we are dealing with the same things. I have been on many sites discussing this so I will share what things I had to do to stop my lights dimming and my other problems. First, since there arent any bigger alternators available, you have to use a capacitor. 1 or 2 farad is not going to cut it since the alternator is regulated through the computer which in turn is only producing 100 amps at best. However, when I researched alternators, our stock alternator is only giving our stereo about 40 amps to work with since the stock electrical system uses about 60% of the alternator and maybe even more. People will tell you to use as many batteries as you can and that may be correct if you plan on playing ur system with your car off for a long period of time. Do not replace the stock battery. Heres a few things that need to be done to stop the dimming. And the dimming is really a voltage drop that happens when a loud bass note hits but thats probly not what you want me to go on and on about. To save yourself some money i would suggest doing the Big 3 first. Of course im assuming that you havent done this but i could be way wrong. Change the wires of the following to 4 gauge wire: battery (-) to the chassis, the alternator to battery (+), and chassis to engine. And if you are mechanically inclined then heres a step-by-step tutorial
http://forum.sounddomain.com/ubb/ult...c;f=5;t=007801
Try that first before spending any money. If that does not do the job well enough to your liking, then go on ebay and buy a Tsunami 40 (fourty) farad cap. That is what I used and it is what Unique Autosports used on their W7 install. Please do not buy any batteries until you try this. Im trying to save you some money here by not having you running out and getting $200+ batteries. Let me know how this works. Wish you luck.