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The callipers and discs from an M4 should bolt straight on to a e9x
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they shouldn't.
m3 e9x/1m e8x has 138mm between caliper lug mount bolts, e9x/e8x non M has 122mm between bolts, same size as on f3x and f8x.
f3x has fully the same lug mounts as on e9x e8x non M, cause you can take 370mm rotor from f3x and fit it with same for 4 pot.
but! 4 pot caliper on f8x works on 380mm rotor with different height (from memory 62.3 vs 73mm on non M), so lug mounts has the same size between bolts but all other dimensions differs from non M upright.
and, 340 and 370mm rotors are shit, compared to 360/380 M rotors, because M rotors has floating construction (non M are two piece but fixed).