Either a semi-auto box, active suspension or a V12. Seeing as they didn't run a semi-auto until a one off in official practise in Hungary 91 on the 4/6, and didn't run active in 91 at all (until testing the 4/7B in Portugal '92) I'm guessing the '90 Monza run was a V12 test on the 4/5B.antiuser wrote:What significant modification did McLaren test (and later shelf) at Monza in August 1990?
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