The Screamin' Demon Coils are designed to produce an exceptional spark throughout the entire RPM range with virtually no drop in power. Stock coils are notorious for falling off as RPM goes up. Our Screamin' Demon Coil has been dyno tested providing 3 more horsepower at 5000 rpm over stock coils. The Screamin' Demon has a brass terminal for which your coil wire attaches to. The brass terminal is more conductive than the stock aluminum terminal and will resist corrosion longer. Plug gaps can be widened to .060" due to the energy of this coil. The wider spark plug gap will allow more spark energy into the combustion chambers providing more power and improved mileage. The Screamin' Demon is too "hot" for stock plug wires. 8 mm spiral core wires are highly recommended. The Screamin' Demon is an externally mounted coil.