One problem related to manifold/header/muffler/tail pipe has been reported for the 2006 Suzuki Grand Vitara. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Suzuki Grand Vitara based on all problems reported for the 2006 Grand Vitara.
Driver side intake manifold butterfly valve came loose and the screws went through the engine. Recently the butterfly itself got stuck and leaned out and ruined my O2 sensor and idle air controller.