Is this a repost?
If not, it seems like there are now M-tech carbon front splitter and rear diffuser (for regular E60 w/ M bodykit & for
E60 M5) available. They are all hand made and from real carbon.
I found this information
HERE,
and picture of carbon diffuser on M-tech (not on M5, unfortunately)
here
..and reference picture of rear carbon diffuser at
here
Honestly, front splitter does not look good on M-tech kit. Will it look better on M5??