Another cat by-pass question...

[Rick Lee]

I am having a custom cat by-pass made with an O2 sensor port. I should have it soon and plan to get my 911 through VA emissions inspection just before I do the swap. I have heard that my car should pass even with a cat by-pass pipe. Anyone know if this is true or even likely? How meticulous are they in doing a visual to see if there's a cat on there, or do they just look for the O2 sensor wire and assume you're in compliance.

Another issue: I removed my entire exhaust system a few weeks ago when I had my engine out. When reinstalling we used all new bolts, used anti-seize on them and put in new gaskets. Can I reuse them since they've been on there less than a month? Or do I need new ones? Thanks.

[carnut169]

Here in Ga it would not pass an emmissions test- they do check for the CC.
I can't see why you would need to replace your bolts... they should be in great shape since they were recently replaced (but what do I know??!!??)

[Thomas Owen]

Richard - I have had a cat bypass pipe on every 911 I have owned and have never had a problem passing emissions. Even when I came to Arizona and the visual inspection guy put the mirror under the driver seat area of the car for the 'visual test'...
I now have a Euro-premuffler from Fabspeed on my '88 that I like much better than the straight bypass pipe (it even looks more like a cat).
Regards,

[GB83SC]

You could reuse the bolts and gaskets with no problems.

[Kirk Hawes]

I've passed two emission inspections here in Atlanta with a bypass pipe ( w/ 02 sensor ). Guess it just depends on where you go for the inspection.

[doug petty]

HAS ANY ONE TRIED A GUTTED CATALYTIC CONVERTER VERSUS A BYPASS TUBE. IS THERE ANY PERFORMANCE DIFFERENCE.