The 6ALN for DIRT Motorsports has a built-in Rev Control fixed to 7,600 RPM.. The rev control will save your engine from over-rev damage caused by missed shifts or driveline failure. Originally designed with NASCAR in mind, the 6ALN is equipped with the 6-Pin Deutsch connector to meet NASCAR's ignition wiring rule. This special connector provides a tight, positive locking connection with individual seals to keep dirt and moisture away from each connection. All of the MSD's primary wiring meets MIL-86A specifications with special tinned conductors for superior crimps. Inside the strong cast aluminum housing, the multiple sparking CD circuits are encased in a clear two part silicone elastomer for the ultimate in vibration protection. A special clear base plate is also installed for easy tech inspection.