They persisted wid pull rod beause they have got a better aero setup wid channeling air across the suspension arms with a higher chassis front. But how much they extract performance at the back with it is still left to be discovered with the faulty windtunnel they had. Last year it wasnt beause pull rod was inferior , but de couldn't figure out how to strenghten the flow with the exhaust above the trailing edges of the diffuser.
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