Great question. The Optima battery seems to work on some/few Vipers. Although the battery is definitely better than stock, we have found one that leaves the Optima in the dust. Best of all....it will fit all years/every Viper, offers more power than the Optima, is smaller, lighter, and better built too.
We just finished our battery kits that come with everything you will need for a quick, pain free installation.
If you are interested, give us a call at 408.562.1000
thx.
-Wayne (LTHL VPR)