different ECU types?
Hey guys, how difficult would it be to swap out the m52 engine from a 2002 325ci and put in a m54b30? i heard the ecu is slightly different? i know the m54 used two different software systems, ms43 and ms45, but how do i know which is in the 325ci? and if it is different than the 330 m54b30 engine, how do i change the software? are there extra o2 sensors or what?