Re. the interior noise of the Odyssey, we think the "well" for the spare
as well as for the third seat might have some resonating noise.
Though I don't think it is particularly objectionable, all things
considered with the Odyssey, I have fashioned a "blue board" insulating
item which sits on top of the spare to see if it helped. Also tried
some closed cell insultating material, but really can't tell enough
difference to matter.
An interesting side note....until the '05 Chrysler vans came out, they
pointed at those two "wells" in the Odyssey as source of noise and vowed
that Chrysler would NEVER go that that design. Guess what, the Ford new
van, the 05 Chrysler vans, and the Sienna vans have all gone to the
Honda third seat into the floor. I guess that the market place dictates
more than the earlier sales pitches by the late comers, huh?
Ron