Turbine Body/Housing YELLOW/WHITE/BURNT with pics

I posted this over in the eclipse/laser/talon forum but nobody replied, figured I'd give you VR-4 guy's a try.

Ok I was changing the oil+other stuff and noticed my turbine housing (connected to headers) is not the pretty metal color that it should be. It's yellow and the bottom is solid black (obviously burn marks) It spins fine and the car has good power (MBC set to 13 PSI)

or maybe this is normal?

top pics

http://files.automotiveforums.com/gallery/watermark.php?file=/503/236235ba_1_b_1_.jpg

http://files.automotiveforums.com/gallery/watermark.php?file=/503/23623551_1_b_1_.jpg