I just bought a new sub box/subs/amp combo of ebay and I also got a 1.5 farad cap (BMW)cause I thought I'd probably need it. My speakers pound and suprisingly my Honda battery holds up pretty well without the cap. I have to turn up my system pretty loud for my headlights to even dim slightly. I paid $50 for the cap so I figure I should hook it up anyway, or would it be pointless? I've heard it also improves the quality of the bass, in which case why not? Should I bother spending my time or should I just sell this thing and get my $$$$$$ back? I'll probably hook it up anyway and hear for myself, whataya think.