Prothane Motor Mount Inserts are a clever way to increase a vehicles performance. Vehicle manufacturers often create motor mounts with voids or holes in them. These voids are designed to give the mount a level of play that can soften engine vibration. Prothane Motor Mount Inserts fill those voids, effectively making the mount solid. While this does decrease the vibration that can be absorbed by the mount, it also dramatically increases the throttle response. By allowing the engine less movement, these can increase throttle response, reduce wheel hop, and even improve traction.