I just got a Bazooka Tube and installed it into the back of my 95 Altima. When I close the trunk it gives me a loud woofing noise that sounds like ground noise. When the car is on (keys in the iggy) it does it, if they arn't in then no noise is emitting. Anyone got a clue? I'm still new to cars and doin ym best to get things done. Thanks!