One problem related to manifold/header/muffler/tail pipe has been reported for the 2007 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 GMC Acadia based on all problems reported for the 2007 Acadia.
Bad engine oil leak and is dripping on manifold shield which causes smoke. . . It is getting worse. Could catch fire.