lol or it doesnt have anywhere to go...
but it all really depends... sound deadener will change the res freq because the pannels wont be ratteling anymore just the subs force.... it will also usually sound quieter outside the vehicle but louder inside (like i said thou alot of factors matter and effect what the final outcome is in you vehicle) For sound quality dampener is a must for spl alot of people use it as well because it can up your score somewhat