With the kind of miles you are putting on the car, I would spend the money on the cooler guard and screen kits for the other coolers. I am not sure which of the several sellers I would buy from — there are at least 3 and each is a little different.
I would also PPF the front 1/3 and lower rear quarters. That will help the paint look less sand blasted at 100k plus miles, at least in the Northeast where I drive. Maybe in the south or southwest that is not a problem.
Certainly spend some money on fun parts if you can. A tune and secondary down pipes, and mild handling improvements. 50,000 miles in a year and you are in the M5 for at least 800 hours. Fun parts are worth the cost.
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