C55 O2 bung








Well, for now I just want a few accurate stock baseline readings and then a few with my Renntech Airbox. I believe doing it this way will deliver the most accurate results should I decide to get an ECU tune. It would be great if I could use the existing bung on the C55 stock exhaust where the O2 sensor already goes but I'm sure the ECU would freak out as soon as I did that...
the bungs are straight fwd-anyone can shoot them in (they sell SS ones for $5 on ebay)-


