I don't know how true this is of all Vipers, but my Viper's actually not a dark or muddy sounding guitar at all. Maybe it's the rather light mahogany used, the thin-ish neck, and the ebony fretboard, but regardless of the cause it's actually got a pretty articulate (if thick) tone - sitting somewhere between the average SG and LP. I wouldn't have any second thoughts about sticking A5 Warpigs in it. In fact, if I didn't love the Blackouts so much that's probably exactly what I would do.
edit: I should say that i have no first hand experience with Warpigs, but I think anything less muddy than Invaders would go fine in the Viper, and I seriously doubt the Warpigs are muddier than Ingayders :)