I recently purchase a 30' Spectre with Stellings exhaust. I have found that 3 out of the 4 manifolds had small exhaust leaks around the gaskets. I've heard this can be a problem with the Stellings. Does anyone have any advise or tricks for when I re-assemble that might help this situation?

What is a good Muffler to use on Stellings?

If you have a internal transmission and "damp" exhaust, I've seen Borla mufflers used with success.

The gasket is proably leaking because the bolts loosened up. Try putting a extra thick washer under the bolt and use some blue thread lock. I've also taken to smearing a really thin film of copper rtv on the sealing surfaces.