Car appreciation... the aesthetics, the engineering, etc

Two questions, firstly how does the exhaust stay blue, is it ceramic coating? Secondly, more of a general question why the lack of screen? I understand the motorbike thing but as I get older I value my eyes and like some wind protection, even on a motorbike.

A screen is a massive air brake. Seven shaped cars have appalling aero, little is quicker up to 100mph, but beyond that if you have a screen a hot hatch will be as quick.

Taking off the screen improves things massively, but you do have to wear a lid. A bee or stone in the forehead at speed isn't pleasant.