The NKG BP6ET's made a significant improvement in performance on my 1985 WWW 2.1L w/ 1.9L components. I drove to San Jose from Tracy with Super Bosch plugs and had a bit of stumbling, especially after fairly long downhills. Even on the flats the motor seemed to be lacking a bit of power. So after I got to San Jose I swapped out the Bosch's with the NGK's for the drive home and I was quite pleased with the results. Night and Day no doubt. 
Paul in Tracy

Sent from my Pad where I keep my iPad

> On Sep 27, 2014, at 2:55 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
> 
> Not long term although many have. They are too long bringing the flame front close to the piston. If you want the multi tips get the 4477 Quads or the newer version. I forgot the new number. I am on the road
> 
> 
> Dennis,
> From my phone.
> ________________________________
> From: John Rodgers<mailto:jrodgers113@GMAIL.COM>
> Sent: ‎9/‎27/‎2014 5:50 PM
> To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM>
> Subject: Spark plugs - 2.l L
> 
> Can  Bosch plugs number W7DTC be safely use in the 2.1 L wasserboxer?
> 
> John