[ursus]

I believe the testing was done on a 3.5 Altima Coupe

Here are some technical specifications of the OEM vs. STILLEN Rear Sway Bar...
2008 Altima Coupe

OEM Rear Sway Bar
0.730" Thick - Hollow Bar - 1/8" Wall
280 lbs. @ 1" Travel
580 lbs. @ 2" Travel


STILLEN Rear Sway Bar
0.750" Thick - Solid Bar
320 lbs. @ 1" Travel = 14.3% Stiffer
700 lbs. @ 2" Travel = 20.7% Stiffer

So basically when loaded, the STILLEN rear bar is 20% stiffer than OEM.