That's correct, the CSL was not imported to the US. I know of at least one. I've read about one down around Miami. Here's one that was for sale this summer down in Miami (same one maybe?). Although, I'm not sure if it's a real CSL or just a doctored M3.
http://bringatrailer.com/2011/06/04/...03-bmw-m3-csl/
Some discussion here on the outrageous costs and legal hoops necessary to legally import a non-US spec car:
http://www.bimmerfest.com/forums/sho...d.php?t=130441