RACEAIR MAX BIG SINGLE by PCIItem #: 586 For those that dont like to share and the standard single isnt enough. The Big Single uses the same high velocity motor as the PCI Race Air Dual. With its efficient high volume air flow of clean air blown into two PCI Race Air helmets! This heavy duty motor will last several seasons of racing in heavy dust, moisture and puddles of water! The very best in fresh air systems = PCI Race Air! 12% more velocity than the RaceAir Flow! Includes