Does it really make too much of a diff. between aluminum backing and non aluminum backing? I'm not looking to compete but what to kill some of the road noise.

 

Makes no difference. Its the thinkness of the material that does.

 

Are you talking about sound-deading material with aluminum film on it, as in the diff. between Dynamat and Extreme Dynamat? if so, I have heard the difference is noticable, but I would probably get the regular stuff and use the extra money to buy a little extra. The rear wheelwells, under the plastic molding in the trunk is a HUGE problem area. Plus, if you had some extra Dynamat, you could take care of the sail panels and doors. Also, you'd be suprised at what a difference new weatherstripping around the doors/hatch can make. Even a small gap lets in an enormous amount of road noise.

 

ok thanks for the help and replies