This is the RAI Threaded and Jetted that can be threaded into any factory 02 sensor bung and will work for any exhaust system. We use them for all of our systems to make sure there are no CELs, with or without a catalytic converter. These pipes also make oxygen sensor installation easier. The RAI Jetted spacer is made out of T304 stainless so it will never rust and it's built to last the life of your car.