Hey zenzen I would like to say that I know what your are talking about since I had the same exact problem. And it evens happenes when I overtake somebody and I step on the gas. I would like to say that, that's is because of your car not burning feul properly and few reasons for that one you have a bad air filter which doesnt provide the needed oxygen when required and that's why your get the smell. Second the sparkplugs not burning the feul properly and you got some extra gas coming out. And last dirty feul injecters. Start from the cheapest and go up and see if the smells goes. Me I replaced the sparkplugs and it went away.
