Due to demand, now available AMPLIFIED. Comes with a built in 150 watt amplifier with built in crossover, and YES, THE BOTTLE VALVE IS THE GAIN CONTROL! Without question, the wildest and most original subwoofer enclosure design in the history of car audio. Strap this monster in your ride for a quick and easy Bass Boost. Use it alone, in pairs, or even mount it next to your existing Nitrous Oxide system. This 8” subwoofer is simply a Bazooka subwoofer with the patented Bass Tubes enclosure camouflaged to look like a Nitrous bottle. This unit comes complete with tank, cosmetic nozzle, braided hookup wire, and a complete aluminum mounting kit.