Not really, but some people have hooked up the behringer feedback destroyers in-car. No, you can't parallel two computer psus. Sell the amp and buy a home amp.
Using a PC atx psu, hook the amp (+) up to a drive molex plug using the yellow lead, hook the rem power on lead of the amp to the yellow lead as well, hook the amp (-) up to a drive molex plug using one of the black leads. Short out the green wire on the motherboard molex to any black lead to...