I have an 05 wrx with no mods, its my daily driver. I changed the oil last week, last year my head gasket had a leak so lots of money later the car has been running fine. However yesterday I stopped the car and it was smoking from under the hood, smelled like coolant. When the car was cool i checked the top coolant resevoir on top of turbo, and it was full. My temp gauged had not moved, I checked the oil it was low, brought it back up to level. coolant levels are ok; when the car cools, the overflow is a little above the full the mark. There are no signs of a leak of coolant or oil near where i park. The smoke seams to be coming from below the turbo, maybe near downpipe. I need some suggestions on what to do, and what to keep an eye on, or where to start.