Return MM3 To Stock File Before Adding New ECM File

[Teflon]

Hello,

I got new WARP tunes from DRD.

I currently have emissions tuning on now with the MM3 for my 16 Cummins.

Do I need to return it to stock before I put in the new ECM file and tunes from DRD, or can I just put in the new sd card and rewrite to the ECM?

Thanks

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[Teflon]

I got the answer.

New files and program over whatever ya got and it will work just fine.

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