right here-There was a write up of how much everything weighs in the car, but I can't seem to find it
Sounddeadening material including tar and the rubber firewall blanket and steel weights 52lbs
I took my back seats out for a few days to see what it was like, and i said F-that.When I have a bike in my car, well the back seat is folded, so I can hear so much more noise. I was just surprised how well the back seat shields all that sound.
Maybe a piece of plywood would kill the sound, if you remove the back seat, but then again it might be just as heavy...