I got to say I like the DUIand also love the Pertronix Ignitor3 Flame Thrower Have one on my big block. I had a distributor stock built up for dragracing, put good money into it. For the hell of it a friend had two sitting on shelf asked to try the Flamethrower out. The engine ran better , spark was hotter, plugs are the most perfect color. The wierdest part at Idle and cruising rpm dropped 300 rpm. Still doen't understand why but love the distributor. Best 260 ever spent, I don't like useing spark boxes either.