Specs:
Front Sway Bar 35mm (Ø1-3/8") Hollow
+230% Stiffer than Stock G37
+205% Stiffer than stock G37S
+230% Stiffer than stock G37S
Rear Sway Bar 28.5mm (Ø1.125") Hollow 3 Way Adjustable
+130, 185, 260% Stiffer than Stock G37,
+15, 40, 75% Stiffer than stock G37S
+60, 100, 155% Stiffer than stock G35S
Effective 8-17-2010 the size of this rear bar has been changed from 27mm to 28.5.
370Z Stock VS Hotchkis Sway Bar Upgrade Comparison Video