GodSpeed

Two things... First the intercooler is designed to take advantage of the cooling properties of alum. a black finish will ABSORB heat.. which is a bad thing... you ever touched black asphalt in the sun compared to concrete... and the other thing I polished my intercooler with no ill effects I used 320-400-600-1000 grit paper then used steel wool the fine woodworking with some mothers alum polish then just a cloth with the polish and alot of buffing and it looks great

I put 40 below in my oil and it actually made the car run cooler.. I was amazed at the difference.. its getting cold here so i am not going to put it in the rad yet but i am impressed with their product so far.. and i figure cooler oil can only help!!