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The next step up from our Performer Series Carburettors is our Thunder Series AVS which was designed and calibrated to deliver optimum street performance in hundreds of applications. Primary and secondary booster clusters offer the most accurate and up-to-date calibration available for today's fuels and octane levels. The Thunder Series' unique Qwik-Tune Secondary Air Valve allows for limitless calibration of the secondary circuit with simple hand tools while on your vehicle. It can be easily adjusted - in seconds - to suit your application, no extra parts required to achieve optimum performance. minute) for optimum They are available with either manual or electric choke in sizes of 500, 600, and 800 cfm (cubic feet per performance for small-block or big-block V8s