Originally Posted by MaQG37

I wouldn't trust their 95% effectiveness. It's a hit or miss really. And, you're taking a bigger risk with test pipes throwing the CEL because the exhaust flow is not going through a cat.

I'd reccomend installing a J-bung extender, similar to the ones Fast Intentions and Motordyne uses on their products. Vibrant makes one that is a bolt on to your existing bung. I actually bought one to use for my Beluga. I'd sell it to for you cheap, but you'd have to buy another one for the other test pipe.

Originally Posted by VQCrew

Ok, So this is what your talking about?
Vibrant Performance 11620, Vibrant Performance Oxygen Sensor Fittings And Bungs | Vibrant Performance
How does this bung differentiate from the 90 degree extensions, or the other spacers/adapters/anti-foulers?

Originally Posted by MaQG37

It's simple, the length and angle of the spacer is further than a traditional anti-fouler. And since you're adding this to an existing spacer, you create even more additional distance to push out the exhaust flow readings.

Don't quote me on this, but I think the sensor reads the velocity of the exhaust flow after the cat to check if the cat is functioning correctly. It has a pre-defined reading to check for.