I asked ZF if they had some advice for us tuned 335i owners. This is what they said.
"Many Thanks for your enquiry.
Please be advised that we are unable to give advice regarding a car that is “non standard”. We cannot comment on recommendations for any particular transmission “upgrade” to match your re-tuned, uprated engine.
We only know the transmission part numbers for the standard applications – ZF do not have a department for non standard applications.
I am sorry I am not able to be of more help regarding your enquiry."
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