With a total of 4 map sensors on your Demon, there's always a chance that one could go bad for one of countless reasons. This is the genuine MOPAR DEMON Challenger Map Sensor. This listing is for one (1) map sensor. *Currently, we are waiting to confirm 100% that this is a 3 bar map sensor. We cannot say 100% for sure until we successfully test the units up to their max boost levels. Some of our customers believe that these Demon map sensors will be a good upgrade for their Hellcats. They will require tuning modifications to work properly in the Hellcat and in time we will have and provide the correct slope data to use these in the Hellcats. Due to the factory IHI supercharger reaching max boost right where the Hellcat map sensor maxes out this Demon map sensor would be a worthwhile upgrade for Hellcats when using with an aftermarket supercharger build such as a Whipple, Kenne Bell or Magnacharger upgrade.