I have had exhausts/extractors wrapped, painted and ceramic coated on various cars. The only one that had any effect was ceramic coating - albiet only until it cracked and crazed.

Wrapping, whilst reducing the radiant temp, actually increased the extractor metal temp and promoted rust.

Painting just burnt off in weeks despite being rated suitable to paint the sun

The ceramic I used was Jet-Hot hi-temp. It lasted about 2 years of hard work before it cracked and crazed, but it reduced radiant temp greatly and the extractors didnt expand to greatly from the metal temp.

http://www.jet-hot.com.au/

when i got my new extractors they were nickel coated to keep them from rusting whilst on the shelf.

after 2 weeks on the road, this nickel coating burnt and flaked off.

i took the extractors off and painted them with VHT 1500
and its great stuff.

if i painted them with the nickel coating still intact, then it wouldve burnt and flaked off anyway, so be cautious of your extractors you have now harley

_________________
Inconspicuously Conspicuous
Appreciation without Depreciation
forever chasing clearer skies...