AEM Infinity has a Viper specific unit we developed on the Gen 4's years ago. I believe its applies to all Gens.
Hey Dan,
If I recall, the AEM Infinity-10 has been discontinued for a while now due to ongoing QC issues... much like the 1500U's of yester-year.
To the OP, for a G4 application my suggestion would be Pectel or Motec. To this day, I believe the Pectel SQ6M12 & MQ12 were the only controllers capable of running a Gen-4 without a single extra accessory box of some type. All other options require Wideband expanders, Ignition modules or drivers, Drive-By-Wire expanders, or similar... even the Infinity and Motec options did/do as they are all TTL based ignition outputs and/or dont have internal lambda drivers.
All that said, the Motec M1 series is a great option as well, and would be easier to find someone familiar as its far more common than Pectel.