I own 2002 Hyundai Accent, MT, 1.6l, 2 door. When I'm driving and go past 40MPH the engine begins to sound like the exhaust had a hole somewhere but as soon as I veer slightly to the left the sound goes away. It's been doing it for more than 2 years, I also changed the gasket betwen the manifold and the front pipe to no avail. Other than that the car runs great.

 

Are you sure it comes from the engine? It is speed dependent therefore it is more likely coming from the wheels. Bad wheel bearings make a growling sound and that sound can change with steering input.

 

I'll look into that. Thanks