I'm guessing that there are variations in the way the bars attach from the Allroad vs. S6.
There were more Allroads produced and I would assume that's why Hotchkis stopped producing the S6 kits in 2014..supply and demand.
Regarding the comment from "mr_dave", the assumption probably would be that the RS6 bars are larger because this model would assume more aggressive driving (which is exactly how I'd drive the wheels off of it, if I had one). The S6 (for me) strikes a good balance of having a more than fun (non-track oriented) wagon that can carry my 3 dogs and gear...which could use a little less body roll, but won't drive as aggressively as an RS, hence, not needing more meat/diameter on the sway bars. Also, if I were going to go with bigger RS bars, then I would assume that my S6 would be less utility oriented and I'd be also upgrading the spring rates/height and compression dampening on the shocks. Once and if my auto tranny goes kaput and I change over to a 6-speed, I may consider that...
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