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Here you can see our baseline, throttle body, and underdrive damper dyno pulls. The damper didn’t really add any horsepower to the curve until around 4,000 rpm, but it did give a small increase in the low/midrange area of the torque curve. When combined, the two parts gave us substantial gains across the entire graph with peak gains of 18 hp and 13 lb-ft of torque. Pretty good considering it only set us back under $400 and a couple hours of time.