Dynamat won't make your car more QUIET, its purpose is to absorb VIBRATION by adding MASS to a metal panel that is vibrating. I'd try putting the subs in your car first, then look for any vibration and add as necessary. I actually didn't have any issues with vibration in the trunk, when I see a lot of these installs with the trunk floor matted I think its pretty pointless, that will never vibrate and make any noise. A lot of times you get issues with things like the hatch or parts around there that could be helped. But honestly, I've matted a whole car before when I didn't know better and it really does little to combat road noise. Open/Closed cell foam does a much better job and blocking sound and quieting your drive. One thing that has always been effective for me was putting foam in the doors between the plastic panel and the door metal if there are open gaps, fill it all with a sound absorbing foam. Wheel wells COULD be useful to mat if the metal was straight up exposed to the road, since debris would hit the metal and cause a sound when doing so, that would be muffled by the metal having the mat on it, but they're not really exposed, there's a plastic wheel well piece, which is really where all the road noise is coming from anyway. One other useful mat application is in the doors, the idea is if you have really strong midbass in your door, where lots of air is flowing and the speaker is shaking the door, adding mat will stiffen the door to keep the volume of the door like a sealed box for better acoustics as well as keep the vibration in the speaker itself. This is why you see so many people mat the hell out of their doors.
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