...and not to forget: Heat wrap raises exhaust gas temp. which raises exhaust gas speed,
for better spool up.
Who knows physics will know, that the hotter gases are, the thinner they are so the quicker they can flow.
:winky:
Same on exhaust system..... a too big diameter in exhaust system can reduce power instead of
raise it.
Exhaust gases can cool down because of the lower speed in a large diameter ex.sys.
and cooled down gases reduce speed and can block the gas flow. ;)