I've done a search on MAC headers and noted some people have required extensions on either the left or right, front O2 sensors. Others have required none. I plan to purchase two, 12 inch extensions to have on hand.

My question is, has anyone needed extensions on the back, after cat, O2 sensors? Specifically for a dual cat car, but knowledge on the single cat would be helpful as well.

Michael

 

Has anyone had to use O2 extensions on the post-catalytic converter O2 sensors?

Michael