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Originally Posted by sperry
Trophy trucks don't need a low CG like a Rally car does.
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A low CG requirement only increases packaging conflicts with a very long LCA, due to the engine getting lower and lower.
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Originally Posted by sperry
Of course there's also the chance that due to homoligation rules, rally teams are simply required by the factory to use the "inferior" MacPherson struts because the factory can't afford to put double a-arm suspension on the production car... But, considering how many things are build into the street Impreza just to make it a better WRC car, I would bet if there really was a big advantage to the double a-arm, that's what would be on the street car so they could use it in the WRC.
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My guess would be that is indeed a rules requirement, and Subaru just doesn't use it in the production cars because of the increase in cost/unit over a McStrut. Even a $1 or $2 increase per car gets real expensive when you're selling hundreds of thousands of them every year...