One problem related to manifold/header/muffler/tail pipe has been reported for the 2002 Chevrolet Blazer. The most recently reported issues are listed below.
The intake manifold gasket is leaking the intake manifold gasket was leaking on my Chevrolet silverado last year I have been told by 4 ase certified mechanics that Chevrolets have extremly too many intake manifold gasket leaking problems because of the dexron anti freeze and the gaskets they used.