I have FatMat sound damping in both front doors, sliding door and rear
hatch. This makes a big difference in the interior noise level.

My biggest noise problem now is the GW stainless steel muffler. It's a
straight through design and really resonates at certain rpms. I have an OEM
replacement (Bosal) that I'm going to try out.

-Mark

On Sat, Nov 3, 2018 at 9:32 AM Dan N <dn92610@gmail.com> wrote:

> I am not an acoustic expert but I do believe in resonance as in musical
> instruments and drums. I'd think most of the noises came from the resonance
> of the wind on the doors and side panels. Knock or tap on a drum or an
> acoustic guitar and you will hear noise or sound.. On a vanagon they put
> some sort of sound barrier on the roof but why not inside the door and side
> panels? The doors and side panel are just large cavities and when wind hit
> them they resonate and amplify the noise for us t hear.
>