Alan,
I went through the same process that you did - dynomatted the entire back wall leaving the vents open, and noticed very little improvement. I would like to know your source for the 1/2" noise insulating aerospace foam. I have removed the rear seat semi-permanently, and will probably build an inslulated panel that covers the entire back wall including the vents.
What are you thoughts on the importance of those vents for re-circulating air? I always run the A/C on the position that allows bringing outside air in instead of re-circulating the same old air. I have installed Ventivisors and crack the window when a little fresh air is needed.
In summary, I find the noise level from those two *&@*%! vents so loud, I think I will block them up.
Tom
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