Exhaust pipe gaskets

[whomadewho]

I have a 1997 Nissan D21 Hardbody SE 2.4 L. Has anyone ever had issues keeping the gaskets between the exhaust manifold and the exhaust pipe sealed??? The exhaust manifold and gasket is new, and the pipe is 4 months old, the rest of the system is in good shape including the hangers. I am on my 4th set of gaskets, the gaskets leak after a couple of weeks. I have tried new studs and brass nuts. I have tried double nutting the studs and sealer. The exhaust system does not appear to be restricted causing back pressure. The engine & transmission mounts seem to be alright. The gaskets are a good quality, not made over the pound. Appreciate any advice.