You need to narrow down whether the noise is at the steering wheel, in the column, or closer to the steering rack.
The one I remember sounded like two pieces of plastic rubbing, and it was right at the wheel.
If it is right at the wheel, there is a slip ring that caused problems on early models. For that, you have to take the steering wheel off, and you are looking for a plastic ring that is rubbing. Some lube can help.
If it is in the column, it can be a bushing, or the pinch bolt near the firewall (from another post, I haven't worked on that component myself).
If it is lower down, it can be the rack, either a problem with fluid (resolved by topping off the fluid in the reservoir) or with the rack itself.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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