Probably 9 changes but would have put some back in again.
Good video btw - https://www.formula1.com/en/video/2017/3/Onboard_comparison__2017_vs_2016_at_Barcelona.html
Good video btw - https://www.formula1.com/en/video/2017/3/Onboard_comparison__2017_vs_2016_at_Barcelona.html
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