[rxspeed7]

That's what I thought he meant. I know on the header it'd be useless but on anybof the flanges after the header I don't quite think they get that hot. Shoot I know of someone that's been building aviation and road race rotaries since before I was born that uses mearly tub and tile silicone for header gaskets and doesn't have a single issue with it. The heat may be there but on a n/a it's such a low pressure area that a leak isn't that likely. Iirc and exhaust leak will actually pull in outside area through the scavenging effect.