Check the archives.  I believe the system was ready to go.

On Wed, 23 Sep 1998, Russell O. Gunter wrote:

> Dear Volks,
>
> I have been off the list for most of the summer but sometime before July I
> remember someone promising to let us know when a stainless steel exhaust
> system for Vanagons was marketed.  Does anyone recall hearing any more about
> this?
>
> Russell Gunter
>