I dont know about most of you guys with the roof spoilers but I opted NOT to use the 3M tape.

 

here is a picture from the tread "We own the night"
it has 2 white IS's, both with black roofs
one has a white roof spoiler and i think the other has a black one, i can't tell.
i hope the owners don't mind me using their picture

 

What rear kit is it? GXF? Can you post a rear view pic of your car?