Well essentially, I would like to re-create the rear O2 mod that i made for my WRX when i removed three cats. Its basically a spacer for the rear O2 bung that removes the sensor tip from the direct flow of the exhaust (the sensor is in fact still in teh system, but because of its new location outside the main exhaust flow, causes it to read a slightly different level then the front O2's. Worked like a charm on the WRX so I was figureing it should work well on basically any car with a strict cat eff. O2 sensor).

The spacer is essentially a pair of 18mm sparkplug anti-foul adapters, drilled out to about 9/16th an inch. The O2 sensor screws right into the adapter, and the pair of adapters put together would pull the sensor just outside the main exhaust pipe, but is not a big enough change in exhaust flow to cause any problems. Of course some vehicles do not have enough room near the exhaust pipe to move this sensor out 1.5-2" in which case ill have to fabricate a 90 degree elbow and mount the sensor, essentially, parallel to the mid pipe with the sensor facing the rear of the car.

Hope that makes sense I've seen it work on many other vehicles, but I am not completely familiar with the Crossfires yet, so I just want to confirm that this rear sonsor is there for cat eff. reasons only

Thanks for your replay, any and all information is greatly appreciated

Tim