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I have a Procharger with twin coolers. I put the meth on the tube coming in opposite the side with IAT. I figured that way I might get a merged temp rather than having it spray directly onto the sensor and have excessively cold readings that were tricking were too cold.
I realize it doesn't answer your question but I thought about it a lot as you apparently are.
If your not using your IAT temps to tune, it doesn't matter. Just understand the temps a saturated IAT sensor reports aren't an actual representation of the charge air temp. The reported temps are basically a BS value that lets you know your meth is "ON". If your tune adjusts timing based on your IAT value it can get you into trouble.
if your not using your iat temps to tune, it doesn't matter. Just understand the temps a saturated iat sensor reports aren't an actual representation of the charge air temp. The reported temps are basically a bs value that lets you know your meth is "on". If your tune adjusts timing based on your iat value it can get you into trouble.
I actually prefer to spray on the sensor. I set up a safety in the tune to pull out 10 degrees of timing if it goes above what I have logged at the track. I know its not a real reading though.
Maf>meth nozzles>IAT. I'm SD now but the MAF is disconnected. I'll get a new charge pipe later. Oh and my IAT is where I said but it's not visible since its on the underside of the pipe.
I have my iat in the pipe off the 90 degree elbow and my meth is the red line , it goes into the tb right at the top . I am sd tuned so no maf . My tuner install the meth setup before as tune and this is the second time i have seen him use the tb to put the meth bung.
My IAT sensor was in the intake where the EGR was, right behind the throttle body. The nozzles were in the charge pipe about 3' before the TB. This was enough distance for the liquid to vaporize to avoid those massive IAT drops that people claim when the liquid gets directly on the sensor.
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Consensus on IAT Sensor Placement on Meth 
