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Message: <blockquote data-quote="stig" data-source="post: 28079" data-attributes="member: 14032"><p>Hi all,Thought I'd share my research I did for a friend of mine wanting to swap an m50b25 into his m50b20 manual.  His main concern is major engine electricals because he's not getting a half cut.For baselining, I used Jan 1991 cars to see what's different.  Let's hope RealOEM data is reliable.E34: 01/1991 Manual M50B20 vs 01/1991 Auto M50B2512 05 IGNITION SYSTEMBoth part(s) numbers are the same12 10 CONTROL UNITBoth part numbers are different indicating different ECUs so a new ECU is needed.  However in certain years, they use the same ECUs.12 22 ALTERNATOR, INDIVIDUAL PARTSBoth part(s) numbers are the same12 25 STARTERBoth part(s) numbers are the same12 28 ENGINE WIRING HARNESS12511703907125117039081 number different, but I guess you can retain either wiring harness...12 29 BATTERY CABLEMost part numbers are the same except 1-2 parts12 95 ACCESSORIES AND FITTINGS (MULTIPLE START INTERRUPTION)Both part(s) numbers are the same.  Is this the immobiliser?SummaryIt looks like it's almost a direct swap!  Do let me know if I have erred on the above</p></blockquote><p></p>