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The sulfur smell is when the fuel mixture is running too rich. At Full throttle, high RPMs not all the fuel is being burned due to things /reasons like Bad air to fuel ratio etc... the partially burned (oxidized) fuel is what makes the sulfur smell.
I dont want to say this but I will anyways. I notice it more on lower horsepower cars like your eco box cars where the engine wasnt built to be Pushed hard at high RPMs. I smell it a handful of times in my previous BMWs probably less than 3-4 times and never smelled it in my Porsche. But smell it all the time in my rental cars like Corolla, sentra's and various eco cars.
I have not pushed the FRS yet so i cant comment.
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