I think the killer when it comes to exhaust moisture and corrosion is if you don't fully heat the exhaust system when you run the car.
So if you are just starting up the Cobra to just give the engine a run, make sure you run it long enough to burn off all the moisture from the exhaust and get a resonable amount of heat into it.
Or just make sure you drive it often enough, hard enough and long enough to get some good temps into it.
