[Hotter]

So I have completed my 328i GM to ZF (6HP21 part 7592503 with HW 7591971 from 2008 325i N53 with 84k miles on it) transmission swap.

Swap went ok, needed few extra parts:
Trans-Support-Bracket: 22326795972
Oil-Cooler Line Feed: 17227577635
Oil-Cooler Line Drain: 17227577636
Muffler Holder Bracket: 18207521602
Transmission Heat shield: 24007535232? (bought by mechanic)

After transmission swap there were no errors and everything worked perfectly. My butt'o'meter noticed that ZF transmission is a bit more aggressive compared to GM, but not that much in stock form. GM transmission seems to prioritizes smother shifts. After few weeks of driving I have flashed my VIN to it with WinKFP and then used xHP stage 3. Transmission is even more aggressive, I guess faster shifts and it does not lose much engine power during shifts as they rev match better?..

D mode is almost perfect, the only thing I have noticed that Kickdown does not work sometimes if you hit it too slow, you need to hit it very fast.
S mode has quite aggressive throttle blips which I am not a fan of when I come to a full stop and it throttles almost at the end of the stop.
M mode has quite aggressive throttle blips also. It seems to respond much faster to peddle shift compared to stock.

Overall I like it, but I have spent ~1500eur (for used transmission, complete filter/oil/seals change, parts, labor, xHP) which is more than I anticipated.
I would say it was worth it if I will keep this car. Although I am thinking about buying 335i - than it was kind of waist of money. But still I am enjoying it.