You'll probably need these.

http://www2.kartboy.com/x4/product.p...4&cat=0&page=1

 

I'm too lazy to post everything, but I found a really good writeup earlier.

http://forum.realmofexcursion.com/el...capacitor.html

It's a pretty good read, but if you need cliff notes:
A 4 farad capacitor ~ 400 Joules, while your battery, is over 2 million Joules. Your battery recharges your capacitor, so once you've depleted the capacitor, it draws power from the battery to recharge, so it can only charge as fast as the battery allows, making it only an extra drain on your battery at that point.

Just what I've found while doing basic research online. However, like jimmy04wrx said, it's still highly debated.

 

Yeah, and thats exactly the point of the capacitor. Even though it will take from the battery to charge your lights won't dim like they would if you didn't have one. The only reason for the power cap is for drivability.

 

If your still looking for somewhere/someone, my cousin used to work at Sound Innovations in Union City. They do some really top notch stuff so they're not that cheap labor wise, but he knows a ton about car audio and could set you up right.

 

I know how to install and everything it's just that now after reading that article I'm not sure if I should use my cap or the car's battery now. I really don't want my car to have dimming lights, but I'd also like it to be at it's max potential.

 

i highly recommend sound source in oakland. Went there for my stereo and tint. Great job!