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1. Can't answer, have not used them.
2. The answer is general terms is; yes. Will it improve SQ? Probably yes; but speakers that are very accurate will actually be more revealing of bad amplification. Maybe call Galen and ask. If needed, many after market amps have speaker level inputs that could be installed quite easily.
3. Yes you can use your existing wires. I've read that BMW speakers can be 2 or 4 ohm impedance. Three ohms probably won't bother the amplification. Remember impedance in a speaker is not straight but varies in response to the input signal. I would be more concerned with the speaker's efficiency(SPL) compared to the stock speakers.
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