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boom or drone

  1. Alfa 159, Brera & 946 Spider
    Between 2250 and 2750 rpm the exhaust (I assume its the exhaust) emits an annoying booming/droning noise under acceleration. At higher or lower revs things are fine (indeed at higher revs the drone disappears and there is a proper growl from the engine), but it is rather annoying at 2500 rpm is...