Three problems related to manifold/header/muffler/tail pipe have been reported for the 1996 Oldsmobile Ciera. The most recently reported issues are listed below.
Lower intake manifold gasket leak on gm 3. 1 l v6.
Lower intake manifold gasket leak into oil.
Manifold gasket failed. Will driving gasket ran hot; the manifold gasket was spewing water and the gasket had to be changed.