Having installed one of these pipes recently I can see where there might be some question with the air temp sensor. There is a large diameter bung (the shorter of the 4) with a hole (.625" i.d). The sensor that goes in the hole measures (.425" o.d.) and there is a small supplied piece of silicon hose (.100" wall thickness) that is slipped over the sensor to increase the diameter and act as a seal when inserting the sensor in the hole. I found this imformation detailed in the instructions supplied with the BAT air pipe. Anyone with similar problems (BAT or other brand air pipes) fitting IAT sensors in the port would be easily solved by either adding a reducer bushing as described above or using silicon sealer as someone else stated.
