capps are useless. if your system causes your lights to dim when the bass hits you do whats called "the big three" thats when you upgrade the two ground wires on your battery to a 0/1 gauge wire, and the same with the power wire that goes to the alt, and it only runs you $20 not $100-$250. if that doesn't do that job than you upgrade to a batter battery, than an alt, than a second or third battery.
ive been doing car audio for over 10 years. i've put together some nice competition systems.