Clarion,also makes a 'dynamat' type product,which comes in rolls and is much cheaper,did my entire trunk space for $138.00.

Make sure you get a quality 1-2 inch hard rubber roller like you use in counter top installation if you apply it yourself.You get a good bond an no air pockets.

Huge improvement on road noise lvl btw.

But even better for the upgraded sound system ,none of that good "noises" escapes.Best of all you wont need to crank the tunes up to hear music over the road noise.