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if im running a 1800 watt mono block to my subs and a 600 watt amp to the inside of my car, how many farads should i get?

 
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Well, by standards, you should be looking for over 2F. But I think you'll be fine with a 2F if you want your lights to stop dimming. ATTN ALL, PLEASE DO NOT TURN THIS INTO A CAP DEBATE

 
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Theoretically, you'd need exactly 2.4 farads. Hard to find a cap that size. I'd go with either a 2 farad hooked directly to the 1800 watt amp, and a 1 farad hooked to the 600 watt amp. You'll still have a little headroom for each. You could also get a 3 farad cap with a distro top, or run to a distro block to split down to teh amps as well. I like the first method better though.

 
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you might need a few ferrets too

 
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true about 2farads is fine but just dont get your hopes up about your dimming lights cause they will most likely still dim.

 
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That's not true. Caps effect systems differently. The only way to determine if it helps dimming or not is to install it and see the effect it has. It may or may not help. For the price of the amount of cap you' need, I'd say to get a new battery first as it'll help more than a cap, but if you insist on getting one go ahead. I'm just leaving you with this thought:

Battery + Ground Kit (made or bought) for less than what you'd pay for enough cap to cover your wattage.

 
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Here you go Lud, Quote from another forum:

"I have a 15 ferret cap powering a 500x1 zapco and a 360x4 zapco amp"