Any statement that Hyundais need GENUINE HYUNDAI parts to operate correctly
That said, I fully support the use of Genuine Hyundai parts. I believe in
most cases they're superior to parts generally available.
In your particular case, there are a few possibilities. First, the
technician may not be diagnosing the problem correctly. Second, the parts
uses in the original repair may not be of good quality. Places with low
prices often achieve this by using the lowest priced parts they can find.
Many times, these inexpensive parts are not of the best quality.
Here's a question for you. Do you have an exhaust leak?