how do you get the sound to come through the trunk? I put a sound system from my other car, (chevy) into the benz and no spl came through, i beleive it's cause of the gas tank, but how do i get it to come around? I want premium sound and i really want it to sound good. i haven't figured out what system i was going to get next, but it might be just 2 12inch solobaric L7s, and a nice ported box. but i need help with it so please help.