If I remember his procedure properly he mounted an intermediate tube between the filter and TB and installed 2 sets of both sensors on opposite sides but inline with each other or offset by 1", can't remember exactly, with one set near the filter and the other 6" from the turn into the throttle body. He's an electrical-type guy who as a hobby does all sorts of testing for RC aircraft manufacturers so he had them hooked up to one of his portable voltage meters and into a laptop to log test results, he also had a thermocouple wired in the tube for baseline tube temps and temp sensors installed inside and outside the engine bay. He logged for a good 3 days of regular driving to get reliable data because he's like that.
He used aluminum for the tube as it's the worse for heat soaking (he's previously tested 3 different types of plastic, carbon fiber, aluminum, steel, and some exotic concoctions he had from a RC parts supplier) and after he put his data together he concluded that the shorter sensor had zero heat soak issues as many people had originally thought. His standard deviation was +/- .5C between the two sensors at any given time and neither was regularly lower than the other. His basic conclusion was that wall height didn't affect flow temperature, distance did have a change in flow temp that was consistent with his previous testing of the aluminum's heat transfer, but downstream flow temps were the same between the two.
If that wasn't as rigorous a set of testing I've ever seen to prove a point I don't know what is. Then again he also did the first retrofit of a 6.4L SRV manifold onto a pre-eagle engine with full functionality for his 440 powered magnum so he also wanted to know for himself.
