"Does anybody have any experiences with using these headers on their
Vanagon?"

I have them on my 87 westy for a year now - work great great fit and
noticeable performance, with just a K&N filter and the S&S Header I can pull
hills at a solid 80 mph. They are not the most customer service oriented
folks - but they do make a good product for the money...  search the
archives for more info, like Karl Bloss's install blow by blow, etc...

Mike

87 westy
87 wolf
91 jetta
96 jetta
90 jetta coupe