John,
 
If you want the answer to your questions got to <http://www.fastforward.ca>.
David Marshal ahs the best and most cost effective ( over the long = run) solution to the WBX problems.
I have seen his conversion first hand and it is a very good set up = and very simple .
I had a chance to go for a ride in his Westy and was impressed with = the power and the fuel economy of his conversion.
 
These are just my opinions, but don't take it from me talk to some = people that have his conversion in there vans.
 
Cheers
Glen
Blue 1957 Single Cab
Tan 1985 Single Cab   
Yellow 1985 Single Cab
Grey 1986 Jetta GLI
Black 1993 BMW 320i