Basic process is the same as converting any M3 to manual. Main complication is that there's no factory engine calibration meant for a manual CSL. But you only have to change a few bytes to get it to run in manual mode, so that's not really an issue anyway.
If you want a smoother gearbox than the M3 gearbox, the Z4M transmission is an option. You would use the shift linkage from a 330 6-speed to get that transmission to work.
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