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From everything that has been said it seems that the most reliable options (subjective) in order are:
1- Map-out
2- NOxEM
3- OEM NOx
NOxEM seems to have some quality issues, yet some have also had great success! Map-out seems better as it has no sensors/ecu etc yet no remapper has confirm all 3 stages in any my emails!
I'll call Map-tech and see whether they'll confirm the 3 stages.
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