Having shipped over 4,500 tuned exhaust systems in the past 15 years Power Flow has received considerable feedback from their customers. Response has been almost universally positive and enthusiastic. Pilots learn quickly that the systems perform as advertised and that is because the company is consistently conservative in its claims about performance enhancements. A tuned exhaust system boosts horsepower and engine efficiency.
Terry Hocking, a CFII/MEI, who trains people in a Piper PA-28 160, said: "While I have not seen a pronounced increase in airspeed after installing Power Flow, what I have noticed is an increase in climb performance. I firmly believe there is a safety of flight component that results from getting away from the ground as quickly as possible." Terry added: "When compared with other PA-28's with the same horsepower, but stock mufflers, there is no doubt whatsoever I have recaptured the horsepower lost by the Piper OEM muffler and exhaust." He noted that he could easily keep up with Cherokee 180's on climb out.
Don Ferguson, who owns a C-172N with a 0-320, reported that he saw a fuel reduction of 0.7 gal/hr at cruise, added an extra 1,500' to his service ceiling and found he had more power at higher altitudes. In flying his Mooney M20C, Fred Perlman has seen "a 2" gain in manifold pressure and an increase in rate of climb that runs 12 – 15 percent".
What the tuned exhaust system does, over original equipment, is to allow the engine to develop near its full rated horsepower which shortens takeoff rolls and boosts climb. Because of the improved efficiency, it takes less throttle to achieve the same RPM or manifold pressures. This allows the pilot to decide whether to go faster or save fuel at previous airspeeds.
For more information, visit powerflowsystems.com.