It was a pleasant autumn evening so i thought it would be nice to enjoy the outside and give "Sting" a full wash. After drying the exterior i opened the hood to clean up the engine compartment. I don't always have time for this but did tonight. I instantly noticed the rust on what appears to be the exhaust manifold? (i may be mistaken and am open for correction!) I don't show the car, and some wear doesn't concern me too much, but i don't recall seeing this before, nor owning a car that looked this bad. Would you consider this normal? This is a 2015 non-Z51 engine. Are these made of some iron alloy? If so that could explain it. Anyway, any comments or feedback would be appreciated. TIA.