Why do you want to be louder sealed up? are you gonna compete at db drag? you can always compete on usaci, meca or another association,my suzuki swift was the same way that your car is right now, my explorer is backwards and man, i HATE the explorer so much, i´m all about demos, demoing a car with everything sealed up it´s just lame if you ask me, specially on the shows where you have lots of people gathered around your car to see everything, i prefer to be louder with both windows open all day long!!!