I dont know how this would work on an exhaust stud, but it works great on turbine engine bolts that are exposed to high heat.
From: Fastener Design Manual -- part one
Silver Plating Silver plating is cost prohibitive for most fastener applications. The big exception is in the aerospace industry, where silver-plated nuts are used on stainless steel bolts. The silver serves both as corrosion deterrent and dry lubricant. Silver plating can be used to 1600 F, and thus it is a good high-temperature lubricant. Since silver tarnishes from normal atmospheric exposure, the silver-plated nuts are commonly coated with clear wax to prevent tarnishing. Wax is a good room-temperature lubricant. Therefore, the normal "dry torque" values of the torque tables should be reduced by 50 percent to allow for this lubricant.
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