You will love this fellow's Web site: Strictly German Autowerks.
http://www.geocities.com/MotorCity/9008/parts4.html

I have spoken with him, and he does bore cylinders and has sources for
oversize pistons.  How big is your wallet?

Keep us posted if you pursue any of his mods.

Stuart

John Rodgers wrote:
>
> This question has come up a few times in discussions with different
> people concerning my engine rebuild.
>
> Can the barrels be bored to oversize? Are there suitable pistons for
> such a rebore? Where and made by whom?
>
> I know there has been a lot of discussion on this list about how bad it
> is to try to hot-rod the wasserboxer in any way, but what about just
> minor changes to tweak performance. Like slight changes in dwell, or
> increasing CR to 10.1 by increasing cylinder bore by 1 mm.. Nothing wild
> mind you, just tweaks. Anything else would probably produce enough heat
> to destroy the thing in 100 miles!
>
> Just thoughts.
>
> Comments??
>
> John Rodgers
> "88GL owner