17. Once the necessary bolt holes have been drilled, install and tighten the bottle brackets to the trunk floorpan. Then re-install the nitrous bottle and tighten the straps in place. Notice the strap and wires wrapped around the nitrous bottle. This item is an optional NOS bottle heater (PN 14164) that heats the bottle to a specific temperature dictated by a small, built-in thermostat. The best (and most consistent) results from nitrous oxide occur when the nitrous delivery pressure is about 900 psi. As temperature drops, so does the nitrous pressure, and this affects dragstrip e.t.'s (due to rich or lean conditions from inconsistent pressure). The thermostat keeps the bottle temperature at about 80 degrees even if cool nighttime temperatures drop below 0 degrees! An in-car switch activates the heater.