VQs don't have carbon issues - Audi's V8s, on the other hand do. Either way, flooring the car once was actually more than enough on older cars to blow some carbon out. As long as you drive your car with some spirit on occasion and aren't a grandma that never revs it above 4K, I wouldn't worry "carbon" build up.
Also, make sure to never fill your car up with anything less than premium. I refuse to even fill up 91 in my cars, 93 only for me.
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