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I plan to install the Roush Phase2 upgrade kit on my 2019 mustang GT, and I am finding that every J2534 device I find is very expensive. Can someone recommend a low cost J2534 device I can use to flash the PCM with the Phase2 Roush tune?

Last week I bought a brand new 2019 Mustang GT with a Roush supercharger installed by the dealer. Today I took it to a shop and put it on a dyno, and it only put out 380hp and 335lb/ft torque at the wheel on a Land and Sea dyno. The dealer told me there is a "break in period" programmed into the...