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sorry to dig up this old thread, but i am having the very similar situation, except mine is a 535xigt with N55 engine. the noise comes at 58mph, and seems disappear at 64mph. but the noise only comes if the gas paddle is stepped, if i lift from throttle, the noise disappear. so basically from 58mph to 64mph, step on the throttle, comes the noise, lift off, noise gone, the throttle is just like a switch for the noise at that particular speed range. by the way, my car is fairly new, only 6 months with 7k miles. any thoughts would be appreciated.
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