sound deadening
Can the 'box' behind the seats be filled with foam? If the box contains a cross member support between post "A" and post "B" and thats all, then what would it hurt to 'pump/blow' expanding foam ( weather proofing foam -Home Depot-) in it for sound supression. I figure it acts like a big drum, keeping beat with the Michelins...
Xfire 2004 Coupe