E30 Zone

alright guys putting m20b25 engine into my 318 got told to check wirinmg at pin 20 well on donor car 2.5 one the wire is red/yellow and on 318 theres no wire at all can i just change engine and plug in and go or do i nmeed to change wiringall the wiring under dash please help as this ois starting to piss me off now

Presumably your 318i doesn't have ABS, or has the early version. The 325i engine loom is wired for ABS, but this won't cause any problems.
Plug and play.

cheers guys thats part one of my winter project sorted