I have a bimmer 520 and the engine is pretty knackered. I'm looking at changing my engine from a 2.0 to either a 2.5 or 3.0 but i want to know if there are any related problems with doing this? do i need to change radiator, gearbox (auto) etc. or can i do a straight swap. I realise a 3.0 will need a new exhaust system.
Also will I need new wiring looms for either of these conversions. I have searched the internet but have come up with nothing so I'm hoping someone on this forum will know