Two problems related to manifold/header/muffler/tail pipe have been reported for the 2001 Mitsubishi Galant. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Mitsubishi Galant based on all problems reported for the 2001 Galant.
The intake manifold cracked in Aug 2014 so I bought one and repaired it and changed three motor and train mounts drove for two months and cracked again right behind the throttle body it started stalling when come to a stop rough idle.
The exhaust pipe started making a loud noise while driving. Vehicle was taken to a repair shop. Dealer indicated a crack had developed in the exhaust pipe. Also this was a common practice with these vehicles, and it may be a defect in this part.