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1989Cars were flying even with the chicanes, the CLR crashes were in 1999, 1990 was the last race without the chicanes.
That was also Road Atlanta, and almost the same place:This, plus a complete blank underbody, hence why the Porsche GT1 flipped too, in Road America.
http://www.youtube.com/watch?v=g8XxQkXCmsU
http://www.youtube.com/watch?v=cLm2iYt9oNg
Your presumption that no effort wouldn't be put on drag reduction instead of high DF makes no sense...They could go faster, but they're bound by a) the regulations, and b) the ridiculous amounts of downforce these LMPs produce nowadays.
Removing the chicanes would add nothing since these cars would max their speed at a point before the chicanes anyway because of these high levels of downforce.