I never said that Active Exhaust is not an option.
I said Active Exhaust is not a Premium option.
You can add Active Exhaust on non Premium cars too. It even says so in the text you copy pasted.
I will definitely use all seasons after my summer tires wear out and will use those tires from April to November.
From November to April I will buy a set of OEM 19inch wheels and put winter tires on them. My manual advises 19" with 255 all around. So my winter set wouldn't be staggered.
Today I got an answer back from the very few Mustang specialists in the country.
They both said exactly the same thing.
They could fix the turn signal issue on my car BUT I'm not allowed to order the side mirrors myself from the dealership and they will charge me approximately 5 working hours +...