Running motor mounts that vibrate at idle and trans mounts that vibrate off idle is a good way to ruin a street car. If you actually drive the car, the vibration gets old fast. If you just drive it for an hour on the weekends and pretend it’s a race car and you are adding a whole lot of performance because the car now vibrates, then I guess it does not matter. If you really have a track car that is street legal just to get you to the track then it is also OK.
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