It is suggested that ignition coil be replaced when replacing this control unit. Installation Instructions The Model 930 6 pin Perma-Tune is designed to replace the stock ignition box and will bolt up and plug in to the same location as the stock system. The Model 930 6 pin is more than a replacement of the original ignition system; it is a performance upgrade boosting the spark energy by a factor of three. This increase in spark energy improves combustion efficiency resulting in more performance and less unburned fuel in the exhaust. Spark plug gap can be increased to .065", (except on turbo charged cars with special spark plugs that cannot be re gapped) and solid core, unshielded copper spark plug wire can be used without causing radio noise problems. For Perma-Tune products,customer MUST call Perma-Tune directly @ 631-909-1011 PRIOR to claiming any unit as warranty. Or contact Perma-Tune @ for further information.