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Damn, I love this discussion.
First off, recent research indicates exhaust gases move faster thru hotter exhaust tubing as there is less drag..(so like chics the hotter the better?)
Problem: this means insulating exhaust tubing and not creating more heat in mid-engined engine compartments.
Safety Note: As a SCCA corner marshall I have personally seen fires in MR2's without aftermarket header "wrappings".
I concure that the 4 into 2 into 1 OEM exhaust header is efficient, but yes, you may gain1-3 HP with aftermarket "tuned" unit-but is it cost effective?
Coatings that add to the heat retention may be valid.
Preventing rust on a 1/4" thick steel casting is a joke, maybe perpetuated by the same folks who paint their valve covers yellow?
Just maybe it all boils down to personal preferences?
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