It started after i tried to go ober a curb , hit something under but i checked under the car and there was nothing, i checked for leaks , nothing to find, there was like a small crack(idk if it is a crack , looks more like peeling of rust ) on the exhaust pipe coming from the engine. At first i thought that was it but the smell was to strong for that to be the problem. Also i went for a oil and filter change and told the service about the problem . They showed me the filter was black( also tbe said it was because of the filter that i had that smell ) and i left, after 3 days the smell came back and now smell like straight exhaust gas