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Ok thanks. That makes sense.

If I purchase an RTD with a tune from a tuner and I have an MPVI2, I can modify the RTD tune or are they locked somehow?

So if I get an RTD & tune from a tuner and I have an MPVI2, I can modify the RTD tune?

I'm having problems reading my 2017 Fusion Sport 2.7L V6. What ECM code do I use? Thanks!