Pushing_Tin (PT) was the first to ask this question, and ever since there has been a group trying to pursue a solution. PT had thought that
Line-X might work so I took the Z in to have them take look. Two things: 1) The estimate they quoted me was expensive, and 2) they stated that they were unsure of the noise reduction (they said some) as the Line-X material itself dries very hard. A forum vendor,
Second Skin is working up a comprehensive solution, and I might be interested in their Spectrum Sludge for the wheel wells.
The
Mazda Shinka RX-8 had a felt lining in the wheel wells to stop the noise.