Kit come with all the necessary hardware for a smooth install. 68A stiffness up to 350HP please check our other listings for stiffer bushing to handle more power.
Bushing after break in period the vibration will calm down but it will still be stiffer than stock motor mounts. Please keep in mind that this is for Performance motor mount kit. It is strongly recommended that all installs be done by a mechanic or automotive specialist. PLEASE MAKE SURE THIS KIT FITS YOUR VEHICLE BEFORE BOLTING THEM IN PLACE. 1320 Engine Mounts are built for performance driving.Although 1320 bushings are made to absorb engine vibration, you may still notice vibration depending on your engine's series and HP. 1320 Mounts removes the dampening oil containers harbored by OEM/Stock mounts. By switching to stiffer mounts without the fluid reduces wheel hop and increases driving response.