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Its the wastegate actuators it might be both in most cases its just the rear. The wastegate actuarors are not covered under the extended warranty to 82k and their about$100 for both from BMW but they still want over $3 gs to install them due to it taking 30 hours of labor. Its nothing serious you won't loose power due to it its just annoying :/ If i were you i would just replace the rear wastegate actuator and leave it at that,it should take more then %50 of that rattle away other then that the front one is very hard to get to and they will rape you on it. gl
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