The difference in feel between the factory and Boomba Racing's motor mount is night and day! Response and power delivery is vastly improved giving the car a true race feel. Engine vibration is directly felt at idle speed and through the entire rpm range, though this is reduced after the mount is broken in which takes about a month depending on your driving habits. Bear with the vibrations in the beginning because this product truly pays off! Power delivery is greatly improved and also the engine/drivetrain is more audible making the driving experience even more phenomenal than you've had in your Fiesta ST! You can install this mount in about an hour and a half using your own car's jack, 2 jack stands, a deep socket with extension, and a torque wrench. The only thing the instructions don't list, is that the torque specification for the motor mount bolts is 50FtLb. Also, don't worry too much if you don't have the correct metric size socket, as a close standard size will work too. Do yourself a favor and order this mount! You will not regret it one bit. Instantly take your Fiesta ST from the realm of Sport to the world of Racing with this Boomba Racing rear motor mount!