Trans swap question....

I have an 04 325ci with an automatic transmission.....I would liked to swap it to a manual transmission....5 or 6 speed....can someone verify which trans are interchangeable for my car? Unfortunately I have the m56 engine of that matters.

Thank you....
Chris

Trans swap question....

Trans swap question....

Does the tcu need changed if I change transmissions? Not a swap but if I the trans or a same trans. 2004 325ci with the 5hp 19 trans.
Thank you....
Chris

Trans swap question....