Motor Mounts mate your engine and transmission to the chassis. Like all components with bushings, they will wear overtime so make sure to check and replace when necessary. If you are making more power than stock, keep in mind that upgraded mounts will be necessary to keep your motor from moving or prematurely wearing the bushings. Solid mounts may transfer more vibration and noise to the cabin, but they are necessary to ensure you can safely make the power you are aiming to achieve.