I have a 2013 Duramax with 5000 bag air spring paired with this supercharger kit. An older compressor is shown. You get an updated model to match the more expensive compressor also sold on Amazon. The difference in price is because this compressor does not include an additional valve and wiring that maintains the minimum PSI bag. With this kit, the compressor will not turn on automatically when the pressure in the bags releases over time to add air. Wiring is easy, this kit only comes with 1…