I came across a sensor on fleabay which includes this:
NASCAR OFFICIALLY LICENSED PRODUCT
THIS OXYGEN SENSOR IS A PERFORMANCE NASCAR PRODUCT THAT WILL GIVE YOU MORE PERFORMANCE THAN NORMAL OXYGEN SENSOR WITHOUT EFFECTING FUEL CONSUMPTION.
Eh? My understanding of zirconia sensors is that they are wonderfully consistent in voltage transfer fucntion, at when new. I imagine the construction may only alter the response time by a few milliseconds. Would you fall for this snake oil?