Don't know about performance, but I do know that if you go much (any) above the factory offsets for a particular body and race on RCP, you'll be shedding tires or busting suspension arms every time you rub the side rails...
I run 3.5 offset semiwide on both front and rear. Higher offsets in the front tend to make the car more stable but can make it less responsive in turns. At least thats what I FEEL like happens. I can't really tell the difference in the rear except I get less roll.
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