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Isnt that normal when you are in too high of a gear for the rpms? The car will boom and rattle a bit until the revs match the gear or you down shift. I have a N26 engine but have this same booming/droning at 1500-2000rpm at 40-50mph usually if I can on any kind of incline.
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My build thread
2015 428i GC - Alpine White - Coral Red - M Sport |