The position that you mount the tank at is very important. The pickup of most systems (unless ordering a special bottle to be run upside down) is in the very bottom of the tank, and is a fixed tube. Therefore, it's important to mount the tank with this tube at the lowest point so it can pick up the heavier nitrous oxide gas in the bottom of the tank. It's also important to mount the tank with the valve pointing towards the front of the vehicle so the nitrous is driven towards the bottom of the bottle when accelerating. One thing to note is that, even though these were high-quality bottle brackets, we would have been much more pleased with them had they set the bottle at more of an angle (like most nitrous bottle brackets we've seen). Having the bottle lay almost flat like this makes it imperative to properly mount it with the valve handle pointing forward.