It depends upon who you sell it to. If it's another BMW enthusiast, it would probably increase resale. If it's Joe Public who only sees a bunch of enthusiast accessories, he might be scared the car was driven hard and it will decrease resale.
Are you planning on trading the car in to a dealer or do you plan to sell it yourself? I'm not sure what a dealer would do, but they rip you off on trade ins regardless of the condition of your car.
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