[Mikeysf30]

Ok so here the deal, I have a 2012 335 with a severe 2nd gear grind, and a newly seized motor (lucky me) with over 100 error codes (according to bmw dealer). I live in Canada and the market here is crazy, combined with the fact there are no 6mt rwd 340s locally or reasonably priced e90 335s. I am weighing out my options but I love the look of f30s.

Long story short I want to do an engine swap. Almost no forums on the subject or anyone that has gone through with a cool build on the platform… what would work? I am friends with some bmw techs that say f30 6mt transmissions are much smaller then previous years or other brands, making a conventional LS swap a serious pain, with a lot of custom work needed. I’m prepared to spend 20k+ on a project if I’m enthusiastic enough about it, and convinced it would be possible (so I don’t need to hear how much cheaper it would be to go buy a 340, because like I mentioned there nothing around where I live)

So, what would be the most efficient swap?
B58? Could I do a direct replacement of transmission with that? What would be needed in electronics? Obviously wiring harness and ecu.
Or would LS/2jz be the way to go?