Pro-Cap Cap-A-Dapt Kit, Fits Band Clamp Pro Mags Increasing The Distance Between The Terminals Lessens The Chance Of Spark Scatter As Well As The Build-Up Of Ozone Inside The Cap. Offers A Full Line Of Cap-A-Dapts For All Pro-Mags MSD IgnitionMSD Pro Mags are engineered for a wide variety of racing applications. Each Mag is supplied with a durable cap and rotor that has been tested for performance. When space permits, upgrading to a larger diameter magneto cap can further prevent chances of crossfire. Also, if you're using a timing control to retard the timing, a Cap A Dapt is highly recommended because the retard affects the rotor phasing. Details: Emission Code: 5