After years of developing and manufacturing speed mods for Piper aircraft, Robin Thomas started Power Flow Systems (www.powerflowsystems.com) with the intent of using automotive technology to design “tuned” exhaust systems for aircraft. To accomplish this, Power Flow says it customizes the exhaust tube for each cylinder so its length—from cylinder to the collector where the tubes join—causes the low pressure traveling down the tube behind an “exhaust puff” to reach the collector in time to suck out the exhaust from the next cylinder.