2002 buick park avenue. clattering noise resonating through exhaust system after cold start. stops after about 2 minutes
Manifold cracks or gasket leaks, loose connections, internal parts in muffler or cats loose, rusted out.
May be just a heat shield or exhaust rattling against something, Just go to an exhaust shop to have it checked out.
Look for a loose heat shield and hope you find one...that would be a cheap fix
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