The MSD 6-AL is the most popular and reliable performance ignition control available ! The 6-AL delivers multiple sparks for a full 20 degrees of crankshaft rotation ensuring complete combustion of the air/fuel mixture in the cylinders even with nitrous or exotic fuels. This improves power, throttle response, starting and idle capability. Plus the built in “Soft Touch” rev control will save your engine from serious over-rev damage caused by missed shifts etc. Fits virtually any 4,6 or 8 cylinder engine that is equipped with a distributor.