I tested an empty cat on my '84 Westy. The DJ code engine liked it. No O2 sensor use by ECU in that one and I only used it monitor fuel mixture. I noted a slight change in sound. I could not tell or smell the difference otherwise.  

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Dnia 16 kwi 2015 o godz. 18:58 Jack Reynaert <jack007@COMCAST.NET> napisał(a):

> Has anyone ran a 2.1L WBX with the CAT Bypass Pipe?
> http://www.busdepot.com/039251058
> 
> 
> 
> I've referenced this blog on Samba.
> http://www.thesamba.com/vw/forum/viewtopic.php?t=389018
> 
> Can't draw a clear conclusion, looking for input from direct experience.
> 
> 
> 
> Are there any issues which should be considered "pros vs. cons" to running a
> 2.1l with a CAT By-pass pipe?
> 
> 
> 
> I know that a Bung will need to be installed in the pipe to accommodate the
> O2 sensor, but will the O2 still send the correct signal to the ECU?
> 
> 
> 
> What has been the experience of the elimination of back-pressure by running
> without a CAT help the HP and MPG?
> 
> 
> 
> Note: the vehicle is not tested for emissions, so this is not an issue in
> our state. realize resale could be impacted (but will keep CAT on hand for
> that)
> 
> 
> 
> Thanks!
> 
> 
> 
> Jack