Mechanically, it is identical to a euro swap. That means that aside from the brake booster issue, it is mechanically identical to a US S5x motor swap. The only different part mechanically comes in when you try to mount the e46 m3 6spd transmission, as that requires a different driveshaft iirc. There are a few threads documenting that fact, and since I have not done the tranny swap myself I cannot comment further on it.
The S/M54 swap is complicated not due to the mechanical swap requirements but from the electronic side. There is a rather complete thread detailing the M54 swap into an E30, and a select few on S54s.
Because these motors are relatively recent, they have quite a few electronic issues that are expensive and/or time consuming to deal with on E30s. Mechanically, they are simple though. Making it fit is one thing; making it run is another.
The S/M54 swap is complicated not due to the mechanical swap requirements but from the electronic side. There is a rather complete thread detailing the M54 swap into an E30, and a select few on S54s.
Because these motors are relatively recent, they have quite a few electronic issues that are expensive and/or time consuming to deal with on E30s. Mechanically, they are simple though. Making it fit is one thing; making it run is another.
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