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Originally Posted by Welcome to NBA Jam
Mine does it on startup as well. It takes about 15-30 seconds or so before the rattle noise goes away and the exhaust note changes. I don't know if it's normal. I don't experience any specific issues, but if it's an indicator of one, I'd like to get it figured out. I'm tempted to take it to the dealer while the car is still under warranty.
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Start up is normal as the wastegate seals are settling in... I'm concerned about when it warms up... Car holds boost great and only has 24k miles... But i'm coming from an e46 m3, so i don't know everything about this car.