Originally Posted by will abrahams

My Berk HFCs arrived today!

earlier someone asked what the inside of the secondary O2 sensor ports look like. Im assuming they were wondering if they are completely open or have an anti-fouler like small opening.

Here is a pic, sorry for the poor quality.

as you can see, they drill a very small opening to replicate the anti fouler method. I plan on stuffing some steel wool in there too. I will see how it goes...