Cobb Tuning Ford / Mazda Rear Motor Mount Focus ST 2013-2018, Focus RS 2016-2018, Mazdaspeed3 2007-2013 - 891010EMISSIONS This part is not an emissions related part and therefore can be used on Emission Controlled Vehicles. DESCRIPTION The COBB Rear Motor Mount is the best way to minimize engine movement, improve traction, and reduce wheel hop, all without major impact to Noise, Vibration, or Harshness (NVH). Typical bushing designs can rattle your teeth out at idle or during throttle input. This improved version of the COBB RMM minimizes NVH over the previous