i wonder if they make some sort of plug where you can can just un plug the o2 sensore and blug in a cap to keep the connection clean!

 

My rear 02's are "deleted" as well however, I welded a nut (bung) on the pipes and screwed them in. They are plugged in as well. The inspection station guys always look for them and can never fail me for it (even though the exhaust smells like pure strait pipes).