This is an aluminum flange, CNC Machined to allow you to relocated for factory Honda/Acura IAT (intake air temperature) sensor to a charge pipe or intake.
In the factory configuration, it is a known fact that aluminum intake manifolds can become heat soaked, which falsely gives the ECU a higher air temp reading. In a stock motor/ecu setup this isn't a problem, however when you add a turbocharge, supercharger, or other aftermarket bolt-ons, this can cause issues. Ideal placement of the IAT sensor would be right before the throttle body on the intake manifold.
Also, some OBD2 Honda/Acuras come with the air temp sensor in the charge piping, and in a boosted configuration you need to find a secure way to mount the IAT to the charge pipe/intake.
Lastly, the other application these can be used with are some JDM intake manifolds don't have the flange on the intake manifold to mount the factory IAT sensor. You can add this flange to the intake in this situation.
Included with the base package are the flange and two new screws. You can add the option of a brand new OEM IAT Sensor for an additional $20 at the time of order.