Dinan has a history with BMW and OEM rights especially when comes to warranty and any other issues. There is a level of trust and risk. It’s your car and warranty and you have many options. Mine is Dinan for some of these reasons. Not saying any one (Dinan, Racechip, JB4, etc) is better than the other.
It’s just a choice on feeling and history tbh. My 2 cents only.
🤷🏻‍♂️
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