There is this thread about the Diablo 91 restoring where the whole intake was polished, he mentioned a heat resistant clear coat.
The surface does get to hot, 150 degrees celsius at a max. otherwise the hoses would cause problems.

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RaymondQV
Countach QV Ex-Mimran #GLA12997, Urraco P300 #20530 sold in August 2008, Jalpa #FLA12203 sold in May 2006
www.countach.ch
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When Frank Sinatra got his Miura S in 1970, he said: “If you wanna be someone, buy Ferrari - If you are someone, you own a Lamborghini”.