The latest version of the Viper 'lite' the EVO. Changes from the earlier versions are more carbon around the motor mounts and 1.5mm wider stance on the pod standoffs to handle the newer and larger Aios hitting the market. Speaking of Aios the Airbot Fenix here is easily the Best Aio on the market and thats not just because i helped develop it. Its currently the most capable Aio and totally up to the task of running 6s 2203-2204 motors.
using betaflights pid profile switching we are running these on both 4 and 6s

local fast guy CGo flying the Viper 'lite' Evo