That was on a 16v system where at worst it dropped to mid 14's in voltage. You will not see that in your car without fairly strong modification, keep that in mind.
The atomic 3000.1 shares the saame board, but there are plenty of other things different with it vs the Sundowns. Sundowns do plenty morep ower than the Atomic, fyi.
Anywho, although I used to love DD. Sundown or RD or another similar zenon based board would be your best bet for daily power. DD is a nightmare to deal with in regards to customer service