I wouldn't deaden the headliner. I would do the back wall, all 4 doors, the rear floor and the front floor... That should take care of just about all of the road noise and increase your SPL (from woofers) a couple of DB... thats my plan anyway. I just need to take a week off to do it! lol

I use fatmat, if anyone wants to look it up. I also grab a can of elemental designs spray deadener... that stuff works wonders on seams and plastic.

 

Raam is good stuff... I just use fatmat because 100sq feet is only 99 bucks... and it works better than regular dynamat...