I saw that one on pg 14-41 too. What was/is confusing is that on pg 14-50 they show the MAP sensor and it looked like it was the same spot. Looking closer now it looks like the IAT is on the Y pipe and the MAP is on the back of the SC just below the throttle body. I will have to take some pics when I have the TB off again.

But that does answer my question. In order to get the meth to flow over the IAT sensor you would need to run it THROUGH the SC or inject it right there at the Y pipe onto the sensor.