you can get an amp and sub and have it hooked to the stock head unit, thats what i have in the Fusion. Certian amps come with a line leveler already with the amp, but you could also get a re-q or something(forgot the name) that will make your head unit way better in terms of output. Im going MTX sledgehammers, and a fosgate amp. Fosgate amp runs cool. My brothers mustang and my fusion are both running sledgehammers, the Camaro will also be sporting those
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