First off, welcome.

I've used a self-stick acoustic mat on the floorboards and inner sheet-metal of my 1997 Integra; it's made about a 5-9 decibel reduction in road noise and panel resonance.

From Parts Express, I bought a 35 square foot roll of Creative Audio Engineering's VB2 Sound deadening mat. I think I paid about $70.. h:

Installation is a breeze.
Strip out the interior and trim your mat to fit (in sections).
Heat up the mat with a blow dryer, remove the adhesive backing and tack it down. As it cools, use a blunt tool (like the handle from a trowel h: )to firmly adhere the mat without any air bubbles. To do the entire floor, the inside face of the rear quarterpanels, the doors and trunklid took me about 8-12 hours.

:cheers: