It's 15-35hp at the very top of the rev range (Depending on MY).
Most people will not be able to feel that.
I believe ride height is also the same (ZCP lowered the M5 not the M6).
What you should feel is the quicker steering and stiffer suspension.
I've driven both ZCP and non-ZCP back to back and the steering and suspension are very noticable. If you can't feel the difference then you shouldn't get it, but that's why I tell everyone to drive both and see if they can tell.
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