Water/meth and 02 sensors?

I think it depends on how hard you run the motor. One you get above 200hp/liter you are pushing the motor fairly hard. At this point you have to assume some items will become consumables, mainly spark plugs and sensors. Now plugs were always consumables, but you may burn through them faster. MAP, O2, etc, depending on the quality from the factory may begin to degrade over time.