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Originally Posted by Esky
Hmmm.... do I see satin-finished low internal friction exhaust pipe coming?? ^_^
Or maybe heat-wrapping the rear end of the exhaust pipe?
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Heat wrapping does infact increase friction, the faster the exhaust cools the slower its velocity will be. Heat wrapping can be good to help keep the exhaust temperature up to the way to the turbo or catalyst, or to protect other parts from the exhaust heat but that's basicly it.
For protection against heat radiation car manufacturers typically used heat shields, sometimes double wall exhaust systems is used on the way to the catalyst to get it to warm up more quickly.