If your Porsche 911 or Boxster has begun to misfire, idle erratically, or hesitate under acceleration a bad coil pack could be to blame. By providing the proper spark to the spark plug all of these running issues can be resolved. This AA Ignition Coil Pack is a direct replacement for the factory Porsche coil. Made by an original equipment supplier (OEM) these coil packs surpass the factory quality and will get your Porsche 911 or Boxster running how it should be; smooth and fast.