yea i think i remember reading that the exhaust is gold plated or something... here we go:
The efficiency of the insolating material has been increased by facing it with heat-reflective marerial, the most efficient of which is gold. This is quite extensively used, mainly in the engine compartment, at a cost of approximately $3500 ... Text
the reason that it's so expensive because the car is cast out of some kind of plastic I think. Hand built of course. There is a link to a video about the Mclaren F1, but it's pretty old. Try to search for it.
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