If this Durango were to go to the track, it would be required to have a blowdown venting tube run out of the vehicle. Since I wasn't racing, I chose to take the risk of nitrous leaking out into the vehicle, especially because I always drive with the windows down. On the top of the NOS bottle where the knob should be, you'll notice the remote auto bottle opener that NOS has available. It can be controlled via a simple toggle switch or by the NOS P.O.D. controller.