i've realized over a long period of time that there is a gas tank in between my trunk and my back seat which prevents a lot of sound pressure from reaching the inside of the vehicle. I would like to kno if anyone has had this problem and if they have any idea of how to eliminate that specific problem. I was thinking about installing a custom subwoofer in the trunk and i would like the spl to come into the inside, someone already told me to turn on music at a 1/4 tank of gas but that's not a funny joke.