The weight on the S4 is more central both width ways and length ways compared to the BJ4worlds. From my experiance it results in quicker direction change and allows you to carry more corner speed without the car pushing wide.
Having not driven a XX4 I can't comment on the bump handling but seeing them race together I can say that there is very little to choose between the two.
I can try and get a front and rear weight balance later this evening, at a guess I would say around 60/40 rear to front.
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