Hi Mark,
The S50B32 powered M Coupe that your friend has, has a very different harness to the S54B32 powered one.
Some obvious differences are :
- The S50 has cable throttle while the S54 has drive-by-wire
- The S50 has no ASC/DSC, just ABS while the S54 has DSC (similar to the E46 unit)
- Different dashboard
I know the gearbox and rear axle is the same between the two cars.
I am not sure what exactly you have to do with the harness and ECU.
However, I know someone that knows someone that unlocks all BMW ECUs (located in Austria).
The guy I know is using this programmer when they are doing crazy swaps (S54 on E30, S85 on E30 etc) and he was telling me he unlocks everything and you can have an S85 working with the E30 dashboard...
I will ask the guy I know about the Austrian guy and get back to you.
I am sure he is the person that will know what the issues with the ECU will be.
Otherwise the swap should be easy.
My question though is why you friend wants to put the S54 ?
To have 20HP more ?
Seems like a lot of trouble for a small gain.
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