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Didnt I say that? lol

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what about this..its on my d15 ::)it has 3 wires in the white tube...
http://www.imagestation.com/picture/...0/fc9a5d48.jpg

Re:what is this??pic
 

dont worry about that its your EGR valve, like the HF is the only motor that has it. btw there will be an extra plug for it too when you put that harness on the B18 dont worry about that either...

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Its not the coolant temp sensor. Its the coolant temp switch that activates the fan when coolant temp has reach operating temperature. The Hf is not the only one that has the EGR valve becuase h22s and 23's have them.The other motor won't have that and I would make sure the pinout to the ecu aren't taken by anything else cuz you will have to cut and resplice the wire to whatever it may go to.

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well does a b18 have that? and if so where do i plug it in?

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just let it hang, and dont worry about it..