Has anyone upgraded their sound system in a Mondial Cab. I have a 87' 3.2 Cab and I would like to hear the music cut through the engine's sweet harmony, sometimes. I have a Kenwood CD player running the pair of Polk door speakers. I have a new RF Power amp I'm thinking will mount on the inside of the spare tire well in the front truck. Has anybody fit a small subwoofer in their car? If so, where? I appreciate any suggestions.