The other day I noticed what appears to be debree inside of my coolant overflow tank. From the outside above the coolant line, it appears to be a darker shade, and when inspecting inside there are little brownish colored specs stuck to the side of the plastic. In addition, there is a little debree floating on top of the coolant. The only modifications to my car are 3.73 gears and axle back exhaust. Motor is 100% stock minus an oil catch can and valve cover breather with check ball from CFM. Anyone else have this?