The C/F wider rear link mount has been used by the team to add roll stiffness but in a different way to the usual. It has allowed the car to use a softer spring and a longer camber link position on the hub carrier.
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The team has found that this will keep the car flatter in the turn. It has 2 widths, the widest being for carpet as it is the most aggressive on initial steering and then the narrow setting for astro.
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Definitely worth having available as a tuning aid.