One problem related to manifold/header/muffler/tail pipe has been reported for the 2007 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Hyundai Sonata based on all problems reported for the 2007 Sonata.
I had been driving on the turnpike for almost an hour when I started to hear a clicking noise. I was driving about 70 mph and pressed down on the accelerator. When I did so, there was a loud bang and suddenly, smoke filled under the hood and also came out the exhaust pipe. I also saw debris flew out from under the car, looking like it was coming from the tail pipe. I pulled over and opened the hood to find oil everywhere, more smoke flooding out of the hood and bits of metal debris all over. Oil was leaking all over the side of the road. The mechanic has judged that the engine burst while I was driving it.