Dynamat Xtreme makes a huge difference in reducing road noise and in keeping the sound within the confines of the vehicle. Don't cheap out either. Buy enough to line the 'inside' pockets of your doors. Before doing so I got a tinny, tip tip tip sound while tapping the outside door whereas after I got a nice heavy THUD! Also, remember to install it on a cool day or at night so if you misplace the sheet you can easily peel it off and re-do. By the next day this stuff holds with a death grip. See it installed on my build here.