Smaller displacement engines that run through high rpm are in dire need of a high output CD Ignition. At higher rpm, stock inductive ignitions cannot produce full power sparks resulting in a loss of top end power or even a miss. This is even more prevalent when a turbo or nitrous is added to the mix to increase cylinder pressures. The MSD SCI Series Ignitions feature capacitive discharge (CD) circuits which deliver powerful sparks at any rpm. Whether you're idling in traffic or ripping through the gears at race rpm, the SCI Ignitions will be at full power. Below 3,000 rpm the SCI Ignitions produce a series of sparks the last for 20 degree of crankshaft rotation. These sparks will smooth the idle, produce quick starts and lightning quick throttle response. There are two models available of SCI Ignition; the standard SCI, PN 6300, and the SCI-L with an adjustable rev limiter, PN 6320. Both can be used on most engines