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VWs come with a molded plastic "sound deadener" panel under the engine from the factory. It stops just short of the catalytic converter. If you avoid the cat/con and don't have plastic touching the exhaust, concerns about heat are unwarranted IMHO. My coroplast belly pan goes from behind the cat/con to the back bumper and even touches the exhaust pipe on my diesel and there is no indication of heat damage whatsoever. Diesel exhaust is much cooler than gassers (petrol).
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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