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Is it only in sport plus? The car should only be seeing very light throttle at 1800 rpm's. You got Dct or manual?
Giving the car heavy throttle especially a manual is going to lug the engine creating a vibrating feeling at a low rpm like 1800. Ive experienced this in other manual cars, my m4 is a Dct so I wouldn't know as I never give heavy throttle at 1800 rpm
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