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dyno sheet dip rpm

  1. ///M3 Forum
    I went to the dyno today and as the chart shows i have a HUGE dip in hp/tq around 4700 rpm. What could this be?? vanos, spark plugs, being catless? i notice it on the street also so its not the dyno. thanks for any input. Could it be my spark plugs or maybe a after tune could help?