For everyone interested in anti roll bars I made this table to compare the several stock and aftermarket bars.Be careful when comparing tube and solid types !!In general: aftermarket sway bars are stiffer and they are adjustable front and rear to balance the car. They all reduce body roll. Ride comfort is reduced just by a small amount.Some examples:model / diameter front ( x thickness) / diameter rear (x thickness)OEM:A3 Ambition/S-Line: 22,5 x 3,5 / 20,7 x 2,8 both tubeGolf V GTI: 23,6 x 3,5 / 21,7 x 3,0 both tubeGolf V R32: 22,0 solid / 21,7 x 3,0 tube (4-motion)Golf VI GTI: 23,6 x 3,5 / 21,7 x 3,0 PR-0BF or 21,7 x 3,6 PR-0BM (DCC?) both tubeGolf VI R: 22,0 solid / 21,7 x 3,6 tube (4-motion)Scirocco R: 23,6 x 3,5 / 21,7 x 3,6 both tubeTouran 170 HP: 23,0 solid / 21,7 x 3,0 tubePassat R36: 23,6 solid / 21,7 x 3,6 tube (4-motion)Sharan 2011: 24.0 mm / 20.0 mm both solidadjustable sport ARBs:H&R 'regular': 26 / 22 mm both solidEibach AntiRoll: 26 / 23 mm both solidKW clubsport: 26 / 23 mm both solidH&R 'big boy': 28 / 24 mm both solid (heard that there is a 28 mm rear as well on special order)H&R 4-motion: 25 / 25 mm both solidWhiteline: 24 / 24 mm both solidNeuspeed: 25 / 25 mm both solidAPR/Hotchkis: 27 / 27 mm tube (does anybody know thicknesses?)KW CS are identical to Eibach, just painted yellow instead of dark red.