Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice, so feel free to add any additional info at any time.
The smell is normal in the exhaust, but you shouldn’t be getting any exhaust into your car. Fossil fuels naturally have sulfur in them, so it is in all gas. In older cars you never smelled it, because they didn’t have aggressive emissions systems. Catalytic converters break the sulfur compounds down, and when they do it cam smell real bad. Also different catalytic converters will break down sulfur more aggressively, newer or good functioning converters normally put out the most smell when the fuel has a high sulfur content.
Another thing is you can many times help the exhaust smell a lot by changing the brand of fuel you use. It will take about 80 miles of driving to clear out the exhaust system. Crude oil from different areas of the world, have some pretty varied chemistry, it is amazing how consistent refinery’s are able to make gas, all things considered.
Anyway the smell is normal, but can be linked to the type/brand of gas. For the smell to be getting into your car, exhaust gas has to be getting into your car, not good, mainly because of the CO in the exhaust, it is VERY dangerous, and it is orderless. I would have the exhaust checked, and consider extending the tail pipe a few inches, ask a muffler shop what is advisable here, if there isn’t an exhaust leak. Go over all of this and if you have any more questions at all, I am here to help. Good luck with it, have a great day, and Thanks for using Just Answer.
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