One problem related to manifold/header/muffler/tail pipe has been reported for the 2014 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2014 Hyundai Sonata based on all problems reported for the 2014 Sonata.
When accelerating past 3500 rpms there is a clanging sound coming from the engine and you can't accelerate anymore. There has been at times a large plume of white thick smoke coming from the tail pipe when trying to accelerate.