I was looking at the new CB Performance catalog and noticed that they have
performance hydraulic lifters, that have a RPM limit of 6500 now available.
And it reminded me about the solid lifter kit on Ebay.  The stock hydraulic
lifters run flat at @6000 RPM, hence the redline and cut off at 5600 ~5800
RPM.  VW put the limit in due to the limitation of the lifters and the
problems that can happen when they are taken past their rev limit.

I am going to look into the new lifters and check into their dimensions.  If
they match the WBX lifter size, I might consider using them as a problem
plagued VW lifter replacement.  The only concern would be how well it matches
the stock cam for hardness.  The other option is to use a matching cam,
ground to WBX specs (a little bit bigger though) and use the lifters.

Web link:

http://cbperformance.com/catalog.asp?ProductID=57

If the lifters will work in the WBX, then they will be a perfect match to the
Lutz ECU chip that increases the RPM limit.

Robert