I have multiple spare aquamist high speed valves for sale. They allow for the absolute best possible injection system. When used in conjunction with an aquamist FIA2 or any standalone EMS that has built in injection controls, it will pulse in harmony with your fuel injectors, providing a flawlessly linear injection. As your rpms go up, it pulses and injects more and more. With the cheaper injection systems you inject once and thats it. If you inject too much with them down low, you bog. If you inject enough that you don't bog down low, then you arent reaching your full injection potential up top. This allows the best of all worlds. Aquamist retails it for 232 dollars, I am only asking 155 for it. Valve is used.