condensation inside exhaust?
 

Anyone have a experience with stainless tube headers condensating on the inside while at idle?

what brand of header do you have and what engine are they on.a lot of the merc speced cmi headers had leak problems,if this is what you have you should have them pressure tested.

Not merc. Hardin. I checked them all last winter and will do it again this week. But I expect to find the same result, fine.

i have not heard anything bad about the hardin headers.