Its called Spiralmax.  Read about at their website (spiralmax.com, I think
it is.  However, I just tried to connect but keep getting timed out, so now
I'm not sure of url).  Is a metal insert fitted just before the throttle
body, acting as a vortex/velocity stack for air intake.  Supposedly improves
air/fuel mixture & noticably improves horsepower.  I'm no engineer and not
all that mechanically inclined, but looking at the twists and turns of the
intake manifold, I don't quite see how adding this at the throttle body can
make all that much difference once the air gets to the injectors.  Can
anyone explain?  I know their is one list member with van 'vinnie' whose got
one fitted on his van and claims positive results.
-----Original Message-----
From: Per Lindgren <lindgre@ONLINE.NO>
To: vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
Date: Tuesday, October 26, 1999 3:19 AM
Subject: Re: Lead on a Chassis Dynometer located in Raleigh, NC.

>CMathis227@aol.com wrote:
>
>> In a message dated 10/26/99 4:58:08 AM, lindgre@ONLINE.NO writes:
>>
>> << Maybe even the Zyclone?
>>
>> PerL >>
>>
>> Zyclone???
>
>There was some talk about this one on the list last week, it is a
>special piece of metal that is inserted in the air tubing between the
>air filter and AFM, or between the AFM and the throttle body. It gives
>the air flow a swirl, and is supposed to give a few more ponies. Cant
>remember the URL, but those who had it in their van can tell us about it
>again, please?
>
>PerL
>87 Syncro 112i