I have approx 850hrs and I had very little signs of exhaust leaks. The manifolds where just a little bit warped according to the machine shop. The longer bolts where already installed. I am not sure if there was work done before I bought the boat or not as I didn't get good records with it.
jeremy, we had very little signs when we purchased the boat. They machined the manifolds, used the upgraded gaskets, etc. and still developed leaks right away my point is there is no fix.