This is all a direct swap into M54-powered cars. For N52 cars (3.0si), you may be able to use a LUK LF30 power steering pump from an E90 with an E36/E46 steering rack and ATF fluid. The LUK LF30 was used in some early E46s with ATF, and in E9X models with CHF11S.
Parts you will need:
Z4 M Intermediate shaft
Part #32307836809 (LHD)
Part #32307836811 (RHD)
You will need this piece to connect the steering rack pinion to the steering column. The Z4 M one is meant to connect to the hydraulic rack pinions. The standard Z4 intermediate shaft will not fit onto the hydraulic steering rack. You'll save a lot of money buying it used.
Z4 M steering column
Part #32307841203 (LHD)
Part #32307841204 (RHD)
Not required but preferable. Also much cheaper to buy used. The Z4 M steering column doesn't have the electric-assist drive built into it.
Rack and Pump:
Z3/E36/E46/Z4 M steering rack
I used an E46 3-series steering rack because it is the most easily-available.
LUK LF20 power steering pump (M54 Engine)
Buy a used or aftermarket one unless you have a thick wallet.
LUK LF30 power steering pump (N52 Engine)
High-pressure line from pump to rack (LHD, M54 engine)
High-pressure line from pump to rack (LHD, N52 engine)
Power steering cooler loop
Line from reservoir to pump
Cooler return line
Fluid Reservoir and Bracket:
Reservoir mounting bracket (M54 and N52)
Mounting bracket (additional, needed for N52 along with the above one)
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