Hi, there is a group buy going on that started on the m3og/SIG
for a stock CF airbox (E30 M3)
it requires no additional electronics or modifications.
and also a CF valve cover. here a demo pic:
For those interested, there are also DTM airbox
systems available for use
with Alpha N piggy back or full programmable ECUs.
just take a look here for further pics of various airbox:
if interested in getting in on the GB
or details, just contact me at firstname.lastname@example.org