1. Few OEM HUs have RCAs.
2. Probably. BMW likes to mount their amps in the trunk behind the carpet walls.
3. The e36 HU makers were alpine and pioneer/panasonic (one of the two, I always get them confused). It would most likely be the same for the e46
4. Can't help ya.
5. Don't know, but sites like crutchfield and sounddomain have fitment guides that will tell you what fits.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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