The WBX uses the same head gasket design as air-cooled VW engines, many of which have been turbocharged. If you're referring to the water jacket seal, turbocharging has no effect on that. Cooling system pressure remains the same.

Angus

On Nov 10, 2013, at 7:20 PM, Don Hanson <dhanson928@GMAIL.COM> wrote:

> There have not been many turbo'd waterboxers, pretty sure.  Not the best
> engine as a base for significant performance upgrades
> 
>   With the notoriously weak head gasket design of the WBX motor not
> being especially successful holding in  even a normal fuel/air charge
> sometimes, turbocharging one makes not much sense..  The 993 turbo
> Porsche (a one or two model year first try by Porsche to water cool
> their iconic 911 boxer motor) was very similar in design to the WBX
> motor and they rarely went one whole race before blowing heads off....
> 
>  I think Calloway had it right..displacement is the one reliable way
> to up power in a vehicle...when you hop something up with  turbos or
> superchargers or upping the compression or porting the heads or
> anything else, you decrease engine life.   Slapping a turbo on a WBX
> would be asking for trouble...