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Probably not very...

The exhausts definitely won't be - the pipe bends in different spots and where they come out is completely different. The Cooper has a single side pipe and the Cooper S has twin pipes that exit in the center.

Intakes may be interchangeable depending on the intake - the air box it would replace is the same between the two.

There are tuning modules, but I believe they are all made to work with the Cooper S engine and not the 3-cylinder.
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