I have Skunk 2 intake manifold and running cdi box .... Can't figure out what this is for .. Not fan . Not boost not acd. Not fan module.. No knock sensor, crank or pressure sensor or TB sensors... No speedo. .??

 

I believe the grey one is for the maf sensor, the red one is for the factory boost solenoid. and the other is just a ground.

 

No, the boost solenoid is hardwired into a haltech 3 port solenoid,, the maf is hardwired to an aem IAT connector...
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must be an evo 9...
that hard white plastic form, with the electrical tape around it should have a hole through it where it bolts down by the oil filter... if i remember correctly.
that black one wire plug, plugs to the oil sensor on the oil filter housing.

i think the red one is for the EGR
grey one is alternator
round one that looks like a ground, alternator

 

I think you're absolutely right! Those are the two things I haven't plug yet. The alt and the slip on clip to the oil sensor. U the man.!!

 

Actually now that I think about it that makes sense the fact that it was on the driver side of the car was completely throwing me off.