I would rather just use an extender where the original 02 sensor is installed that can be removed later on. The original poster installed a straight extender on his Grand Prix. I was wondering if anyone else has installed an extender on a W-body. It doesn't look like there is enough clearance to even get a wrench or socket on the 02 sensor to remove it without droping the cat conv let alone to install an extender. Has anyone esle removed the downstream 02 sensor and installed an extender without droping the cat conv assembly?
