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2017 X4 M40i
Hello
I recently just purchased an 2017 X4 M40i. Compared to the old BMW 328i I used to have, everything I hear from the engine I'm not use too hearing from my 328i. My question is after exceeding highway speeds of 70-80 mph in comfort mode letting go of acceleration I would hear gurling noise, is this how the engine suppose to sound????
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