I can attest to this for fact. The snorkel was left off mine on initial I4
install and there was terrible cabin noise in the 3K-4K range. It was put in
and I have none of that noise inside now. When I am going up hill, with the
drivers window down, I can hear that same kind of noise outside the van.
What a relief. The PO actually got rid of this van because of this
noise...his family couldn't stand it.
Bob Stevens

http://groups.msn.com/BobsPhotoShare

> Are you running the intake snorkel in the left D pillar?  After my
> experiences with my diesel, I'm suspicious that a lot of 3k-4k I4
> resonance problems are caused by a lack of intake muffling.
>
>
> David Brodbeck, N8SRE
> '82 Diesel Westfalia
> '94 Honda Civic Si
>