5* tuner plugs into the ODB port under the steering wheel while the Livernois you plug into the ODB, then under the hood. I’ve ran 5* in two previous ecoboost F-150s and they have been great, reliable, fast, and customer service was great. I’m running the Livernois in my tremor now because I was way to impatient to wait for 5*. I like it, it’s fast, shifts great, seems to be very reliable, and have 0 complaints ….but if 5* had been out i probably would have gone with them just off of ease of use and my prior experience with them. No idea which is faster with this version of the ecoboost though. Hopefully that helps!