Jeff,

If you look inside the flexible conduit, the thickness and wire mesh
inner
diameter indicates construction to muffle sound.

I can report that it makes a noticeable difference at highway
speeds to have this intake muffling on a Diesel.   As an alternative,
even a
straight rubber radiator hose with a 90 degree elbow at top, running up
to the vent
helps.

I also prefer to run with the sheet metal undercover with foam sound
blocks to reduce engine noise.

Regards,
Brent
'83 Westy, 1.9TD

>
> Date:    Thu, 15 Aug 2002 07:32:25 -0700
> From:    Jeff Kennedy <kennedy@THERIVER.COM>
> Subject:
>
> Hola,
>  at the junkyard last week I came across a diesel vanagon. It had a plastic
> air intake located behind the vents in the upper left rear pillar, and a
> flexible conduit down to the air filter canister. Did the wasserboxer have a
> similar setup? When I removed mine and replaced it with a tiico, the only
> intake apparatus was an "elbow" tube that went from the air filter box to
> the fiber cutout that blocks off the cavity behind the R-side taillight.
> Should I add the air intake inside the rear pillar? Seems like this might
> cut down on noise some.
>
> FWIW, the Tiico is running great, has lots of power. Overall, I'm pretty
> happy with it.
>
> Gracias,
>  Jeff
>