Well first of all the C7.R is an R2 car and it maxes out at 1682, as for best time it 6.6xx per my knowledge how you do that check out the vid below done by Pigp3n
https://www.youtube.com/watch?v=RgCT5pYz6nk
as for the max setup here you go:
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well you can always check PIGP3N's page on youtube bud :)
here is a link its in old format but you can note down the parts numbers and install accordingly.
https://youtu.be/hMgGyp0DV20