RS5 Swaybar compared to A4 B8 OEM & Aftermarket

rear is a paltry 22.5 mm part # 8ko 511305s £101 approx, front dont know, part# 8ko411309n approx £110.stock A4 has three rears depending on model 16 mm 19.6mm and 21.7mm, and theree front 25mm 25.6 and 26.5.I upgraded my rears withe eibach 23mm, and noticed no differance.Someone told me that its not the overall diameter that matters, its how thick the tube is.The yanks like stasis so might be woth looking at a yank site sich as audizine

thats for 2011 models by the way