Powerflex Upper Engine Mount Insert PFF76-925BLKPFF76 925BLK Upper Engine Mount Insert is an affordable and easy to fit bush insert made from our Black 95A Durometer high performance material, which works to significantly stiffen the OEM upper engine mounting for performance on the race circuit or the rally stage. This reduces twist of the engine under acceleration and during gear changes, giving the pedals a more direct feel, as well as reducing wheel hop and letting you get the power down that