on the passenger side rear pillar there's a tube routing the fresh air in
to the air filter box. That tube is made of reinforced cardboard, mine is
collapsing from the inside, restricting the air flow. I took the tube out,
remove the collapsed  material...

image of the tube:
http://www.thesamba.com/vw/forum/album_page.php?pic_id=1267738

a look of the inside:
http://www.thesamba.com/vw/forum/album_page.php?pic_id=1267739

On Sun, Mar 29, 2015 at 6:31 PM, Raymond Markett <raym02@yahoo.com> wrote:

> If the air filter isn't the bottleneck, then a less restrictive filter
> won't do much good. Eyeballing the WBX intake tract makes me think the
> throttle body is the choke point.
>
> Raymond
>
> Sent from my iPhone
>
> > On Mar 29, 2015, at 9:25 AM, Loren Busch <starwagen@GMAIL.COM> wrote:
> >
> > ​RE: K&N Filter in a WBX
> >
> > When I first got my '90 Westy I picked up a K&N filter.  On my first long
> > trip I kept careful numbers on gas mileage.  at the midpoint of the trip,
> > at about 1,300 miles, I swapped in the K&N.  When I got home I compared
> > numbers, fresh stock air filter on the first half of the trip vs. the
> K&N.
> > And not a whit of difference that I could see.  I used the K&N for
> several
> > years but got lazy and went back to stock filters, don't have to clean
> and
> > oil them.  As Dennis said there have been various reports over time that
> > the K&N does not really do that good a job as an air filter.
>