Yes, even my E46 330 convertible has very low noise from the rear. I've tried the later 3 series on runflats - horrible ride and tramlining - quiet though. Talking about testing on our roads, Honda engineers from Japan came to Europe and liaised with German and British Honda engineers to develop the sound deadening package for the 2011 Accord but the updates centred mostly on the front end - bulkhead, screen etc. although in the brochure they boast of a floating substructure to isolate NVH. The 2003-2008 Accord, for me, is the best all-around package,but I'm getting a real bee in my bonnet with the rear road noise. I'm sorely tempted to pull out my arch MLV/CCF/MLV sandwich and try what you used, although being a pessimist I can't see it being a night and day difference. Doing a comparo, the stuff you used has 1 layer of EPDM at 1.2mm thick as a blocker which is very similar to 1mm MLV except the stuff I used has 2 layers of this and the absorber layer of yours is 10mm felt compared to 6mm CCF on mine. Probably even?