I have a brand new, never even pulled it out of the box, MSD digital multi-retard box part number is MSD 8975. This box has 4 stages of ignition retard and a built in start retard each individual stage has 0 to 9 degrees of retard. No plug in modules, digital and uses rotary switches on the sde of the box. I bought this to have more timing retard ability for running more than 2 stages of nitrous. Going with something else, $215 shipped to the lower 48 states, and I can do PayPal, this box is $242 new from Summit & Jegs. Check it out in their catalog for a complete discription. Questions PM or call me (858)531-2963 Gary G.