Hello. I was thinking, is the JCW map going to help a stock Cooper with no other mods? (the map that came with the Cooper JCW tuning kit)

 

Not sure. Probably not or maybe minimally, you might not be able to tell the difference.

The MC ECU is already pretty good vs the MINI ONE.

Without changing other hardware just ECU tuning isn't likely to change much since the rest of the JCW tuning kit isn't present.

If you can install it for free then you might give it a try and see what you think.

Otherwise in the past some MC owners have done the MTH tuning and found it to be helpful (now the price went up though).