This 3D adapter allows you to mount a Honda IAT sensor to one of the sensor ports on the side of the TVS-R1320. This allows you to get intake air temps from the charged air, allowing a more accurate tune. Some of the newer j-series engines have the IAT sensor built into the MAF sensor. You can de-pin the IAT wire, and use the older style IAT sensor that this is for to get charged air temps. One of our customer runs it this way.