I'm not an expert on them at all Bryan -- I've installed a few -- and haven't had any issues with this sensor where I've placed them. I think the heated version heat themselves to about 900*..... I've even seen them where they're probably only reading two of the four cylinders and they read just fine. They need to be burned clean - so "hot" is a good thing.
Some guys run "dumps" with basically a muffler not far back from the collector and a very short downturn pipe on the end. In that case I'd want it far enough from that "opening" that it wouldn't see any reversion - but your system has full pipes so that's not an issue worth mentioning.
My basic understanding is that you want them hot - and in full stream of the exhaust....
I've had faulty MAP sensor -- that was a PITA! And I've had TWO faulty TPS.... one that would just "break down" after driving for awhile. Had to do data logging several times to find that one.
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