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The car should open the flap once it is warm. Yes it will be much louder on cold starts, but that is true with EVERY car, even a prius... Personally, I like the loud sound. I unplugged my actuator in my trunk so it always stays open. Long term I want a BMW PE. But for now this satisfies. If you want a quieter exhaust, I dont know how to help you except to get a 328.
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