Mercedes-Benz GLA Class inc A45 AMG W156 (2014-2020) Upper Engine Mount Insert - PFF40-120BLK This is an insert to fit into the original mount to limit movement of the engine to provide stability under acceleration. A small increase in noise and vibration is to be expected. This should be considered as a performance upgrade. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!