MSD 8970 Three Stage Retard Control
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The Three Stage Retard Control allows you to retard your ignition timing in three different stages. You can activate one retard for a nitrous stage and another at top end in high gear for more mph and still have another module left over for dual stage nitrous systems. When activated together, the retard amounts are cumulative so you get the total of the three. For example, if you pull 2 degrees, then 4 degrees on the second stage and another 2 degrees at top end, the total retard is 8 degrees (2+4+2=8).