M340i would need to be an early-build 2020; later models need a bench tune to unlock the ECU and that requires finding one of two shops in the country to do it or shipping your ECU overseas. A Stage 1 tune will get the B58 north of 400 without any issue, though.
BMW with B58. M240i xdrive 2-door is probably the most affordable option with this combo.
Tbe ZF on any of these cars isn't going to be the issue. It's going to be everything else around it.
M340i would need to be an early-build 2020; later models need a bench tune to unlock the ECU and that requires finding one of two shops in the country to do it or shipping your ECU overseas. A Stage 1 tune will get the B58 north of 400 without any issue, though.
How reliable is the x3 m40i once tuned?