My good friend Eric Schertz told me several times that unless you gotta have the rev-limiter feature built in the DIS-4, you don't really need that as the factory system is enough...
Mine went bad the second time I started the car. Sent it back to MSD then went to Bowling Green last year and the box failed taking the car off the trailer. I could have really used the two step on the pro tree. :frown: That's why MSD stands for "My Spark Died"