I'm currently in the process of setting up Carbon Fibre BMW Accessories company and am looking for an e92 (335i Coupe - m-sport model only) to do development work on. Check out this thread:
I'm currently developing a diffuser for the e90 (sedan) and would like to do the same for the e92 but I don't have access to a coupe.
Basically what I need is for someone to lend me their rear bumper for about 2 weeks so that I can make up a pattern of the current diffuser as a starting point to modify it to the design I'm looking at (again - check out the thread linked above for what the design will look like).
The bumper would be cared for exceptionally well and will be back on the car as soon as the pattern is done for the existing diffuser section.
In return I'm offering the diffuser to the doner for free. The only thing I'd want in addition is to have a photo-shoot with the car with the diffuser installed for inclusion on the website (which will be up soon).
For those looking at getting a diffuser for the 330 and down, that'll come out soon after the 335 version...
If anyone is interested, please let me know!