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The TPI Valve is designed to increase air flow into your air box and carberators. This is one of the fastest and easiest ways to increase performance. The patent pending TPI Valve is totally adjustable, allowing you to determine exactly how much to increase air flow. We call this â€œair jettingâ€. Air passing through the TPI Valve is filtered by an internal filter in the valve. Easy to install the TPI Valve is 1Â½" in diameter and 1Â½" high. One valve recommended for every 200cc. TPI Valves come with a fine filter for dirt applications, or a coarse filter for snow conditions.