rear window visors/spoilers?

[timninja]

Do they exist?

[ELVA164]

If by 'rear window visors' you mean a rear sunshade, they made two OEM types: one was a cloth-type and one was a harder roll-up style. Here are the realOEM links:
http://www.realoem.com/bmw/showparts...23&hg=51&fg=40
http://www.realoem.com/bmw/showparts...00&hg=51&fg=95

Do you mean a rear window spoiler? If so, they did not make that for the E30. BMW and a variety of other companies did make front and rear spoilers, however.

[Ant_e30]

there is actually a rear window spoiler made by some A/M company but it looks like shit. its like a big blocky thing that covers like 1/4 of the window at hte top. It isnt at all nice like the S13 ones etc.

[Mr. Tasty]

get some louvers from z28 camaro.