I think the best thing to do is have them ceramic coated (Jet Hot). If Portland Oregon has a coating shop then everyone should have one. The guy here is a lot cheaper than Jet Hot. The ceramic coating won't come off in you hand, acts as a heat barrier between the muffler and the car, protects against rus for ever, and other that wiping the dirt off needs no other maintaince ever.
On early 911's with fiberglass rear RS bumpers the glass and paint will burn if there is nothing to protect them from the heat. A lot of the guys around here coat both there heat exchangers and mufflers. SSI's that are ceramic coated are awsum, last for ever and transfer little heat up to the motor.
My engine wizard uses the ceramic coating on combustion chambers,
piston tops, exhaust ports, valve faces, and some other coating on valve stems. Any place where heat will transfer to metal. The more heat you can keep out of the motor the more HP you can have a chance of making.
Randy Jones
1971 911
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