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Yes, they have a 4 ohm version.
I've used them in my E90 in combination with a trunk sub with good results.
I can't speak for a 2006 E90, but in my 2009, the clearance between seat rail and the speaker was very close and required some trimming of the carpet.
While they are certainly less expensive than the alternatives talked about here and not impossible to fit, they are not necessarily "drop-in" speakers either.
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