Oxygen senors

So i have another rig (my off road rig) an '87 bronco. Just changed oxygen sensors on it yesterday and now it is like a whole new truck, its amazing! Makes me wonder what changing them on the tacoma will do?? I got about 50,000 on it and its an 06 TRD double cab. Had it in the mountains the other day and it really did not seem to be running well (not much power as usual). Whats your guys thoughts?? And for anyone who has changed them out what did they run for prices?? Thanks!!!

 

I know many guys (very good with cars) who believe sensors like the oxygen sensor to be a maintance item that gets over looked and replace them as often as plugs..??