I only run there once in a blue moon when I am down south, but I also run an X6. I have a 6.5 brushless, with 78/23 and it seems to be ok. Only real difference I make when I race there is lighter oil in shocks. Tyre wise I run staggered ribs up front and schumacher yellow mini spikes on the rear. What weight are running yours at?
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Ford Shelby Cobra Concept Specifications