All Motronic application are boxes wired to the ecu just like Procede.
SO birds sell a hartge box.
When my335d was getting remapped i asked the guy about the 335i. Apparently the y have the software code for the remap, however cant get the ecu the accept the code.
I got the feeling all the remappers have given up
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C350 cdi sport estate facelift 457lbft
130i M SportMercedes C350 CDI Sport Estate AutoMini Cooper Auto.Mercedes E250 CGI,Lexus IS-F,R36, RS4 Saloon,ML 420 CDI SPORT,M6, 335d, C55, C32, M3, M5, S3, ALL SOLD but fondly remembered