Using these engine mounts is straightforward. Just replace your old engine mounts with these new ones following the standard installation process for your Nissan 370z or Infiniti G37. When installing, make sure the bolts are tightened properly to ensure the best performance. As for maintenance, it's a good idea to check the mounts periodically for any signs of wear, like cracks in the rubber bushings or loose bolts. If you notice any issues, contact our customer service for further advice. During normal use, these mounts are very durable, but in extreme driving conditions, pay extra attention to their condition. Remember, these mounts are designed for both street and track use, but heavy - duty track driving may require more frequent inspections. Keep them clean to extend their lifespan and enjoy a smoother driving experience.