ok so when they shipped my jdm d15 in i noticed that there was this white plug (this plug is located behind the intake manifold) held in with two phillips screws that broke off... and im not to sure what that is.... help someone...

 

Sounds like your air temp sensor.

 

does that bolt right up to me si harness or no????????

 

Yeah, it plugs into the Si harness, same style connector.

 

the IAT sensor is in the front upper runner area, not behind it.