meant R5, which has been used on the TON R2. I don't think it adds too much rear if you look at the TON cars running the wing and nothing up front. I would guess the speeds are low enough that it produces a good deal of downforce without being too much for the front. On a road course car or one with more power on gravel, the amount of downforce would increase with the speed and then need some front aero to balance it. Getting into the R5/S2000 power would be enough to make the wing very effective.
One would think that this large works multi-element wing would add even more rear downforce yet than the wing you are referring to, and mandate some sort of front downforce device to counter it (like the air dam/splitter on the top class works cars have), even at 'rough' gravel rally speeds.
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