Ok, after spending some time on the roads, here are my impressions:
After putting about 50sf. of RaaMMat BXT in my car, I can say that it made a difference. Not night-and-day mind you, but it was not insignificant. The overall noise in the cabin is only slightly lower, but the frequency of the noise is much lower. I think that this lower frequency is a lot more tolerable than what I was hearing before. This amounts to a perceived reduction in noise. Highly recommended.
I have used it on the following areas:
- all doors (placing it directly on the exterior skin - yes reach through the panel and put it on there - it makes a difference. Also cut pieces of aluminum to fit in the holes in the interior metal door skin to block noise further)
- rear seat/trunk interface (remove the rear seat bottom and seatback and put it on the plastic panels that separate the cabin from the trunk. I recommend sticking sheets of aluminum on the plastic for added stiffness - this will also make a significant difference)
-rear deck (on the underside of it, the side that can be accessed via the trunk)
EDIT: Total time to apply on all surfaces: 6 hours including ripping all of the trim pieces out.