A: The only air horn models we carry that do not need a compressor/tank system are our direct drive models 6126 and 6127. The come with a direct drive compressor that will pump air directly into the air horn on demand, instead of pressurizing air in a tank. These air horns will be much louder than a stock horn but not nearly as loud as our air horns that are designed for use with a separate air compressor and tank.
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