Holley sniper with MSD6 controller

Ah, that makes sense. Either the Sniper or Terminator will work just fine. The Terminator uses the HP ecu and separate throttle body vs the Sniper as a self-contained ecu/throttle body unit. You get some extra customize-able inputs and outputs with the Terminator and can upgrade the ecu to the HP with a free download in the future if need be. Otherwise, the Sniper is a nice full featured unit, similar to the FiTech but better and supported by Holley.