BackPressure is Useless or Even Detrimental in a 4Stroke Eng' ~

As far as the "CAT By-pass pipe" is concerned ~ Don't ~ It's Bad for the Air

We Breath & it won't do much for Eng' Performance, especially if compared

to a PerformanceCat' ~

                                                        ORR ~ DeanB

On 16 Apr , 2015, at 6:02 PM, Dan N wrote:

> I have hear that without the CAT the O2 sensor won't work correctly because
> of lack of back pressure. If you really want to bypass the CAT the best
> solution is using an old CAT and partially gut it out then you will have a
> bit of back pressure for the O2 sensor. Just hear say I didn't try it...
> 
> On Thu, Apr 16, 2015 at 3:58 PM, Jack Reynaert <jack007@comcast.net> wrote:
> 
>> 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
>>