One problem related to manifold/header/muffler/tail pipe has been reported for the 2012 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Hyundai Elantra based on all problems reported for the 2012 Elantra.
"takata recall" poor engine performance. Rough idle at cold start. Smell gas as well. Randomly blows huge amounts of smoke out the tail pipe while accelerating. "example" merging on interstate. This has been going on since the vehicle reached 50,000 miles. All maintenance work has been done. Now at 77,986 runs like a grass cutter. Just runs rough.