I own a Giulietta but both my cousins own a 1.4MA 135hp Mito and both experience exhaust smell with AC on and Air recirculation on inside the cabin, on high speeds, did anyone experience such a thing ??
Is it visible with the hood up or is it under the plastic below the wipers? Don't suppose you mean the chunky rubber piece at either side (left and right) of the plastic wiper cover that is separate from the thin long rubber seal that runs the width of the engine bay?
I put an image and marked which seal. It is shorter in my car so edges are open. Also it came off from middle so there was an opening. After close middle part it gets far more better but i think i need to change it because of side gaps.