never installed one in mine im a big bass kind of guy but i do know sound systems..now if it is a sealed tube box then place it where the speaker is facing the interior of the car and leave about 2-3in space from the back of the seat..if it is ported then u can put the tube off to the side and the speaker can be right up against the back of the back seat(well as far as u can get it) for the best sound