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You guys are kinda missing the point. He wants to know if short distances (not getting up to temp) repeatedly will accumulate enough water to rust a 986 muffler. Main factors: amount of water, type of metal, temperature.
Most of this has been addressed in some way. Fire creates water, water condenses on cool metal, metal rusts. I would say that the muffler is stainless steel, it gets wet all the time and doesnt rust. Look at the bolts that attach it to the car, those rust like a mother, yet the muffler does not. It may not be polished, but the type of material is stainless. All this talk of zinc plated does not prevent rust, the zinc is a sacrificial metal to keep the integrity of the steel intact.
Main point, always let a car get to running temps and everything will be better.
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