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They make intake manifolds out of plastic, it's not like milk carton plastic, lol.

Even still, I remember that Saab tried putting the turbo in the middle on test cars and it was damaging the paint on the hood.
 

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What kind of underhood temps do you see with a turbo?

How much additional heat do you see with it?

I am guessing that the engineers already thought of these questions and thought that it was okay. Doesn't a diesel run cooler too?
 

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The diesel makes less of the fuel into waste heat...once the engine is warmed up, you're still seeing about 180-90 degrees F, about the same as a gas engine. The turbo is seeing less heat though because of EGT. That's why they could use the VNT turbo in the TDI since 1998 and they're just putting it into a few gasoline powered cars now...the porsche 911 turbo is the only production car to use it so far.
 
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