The hollow design allows for loads of strength without adding a lot of weight. This allows for more sway bar control, which equals better handling. When performance is a must, rely on BMR SuspensionBMR Suspensions SB033 sway bars are available in black hammertone and red powdercoat for long - lasting good looks. Installation time is about 1 - 2 hours. Proudly made in the U.S.A.Below are rate specs compared to OE available barsOE SS bar (FE4) - Hole number 1 provides just over 100 increase in rate over the factory FE4 bar - Hole number 2 is 150 - Hole number 3 is 200OE ZL1 bar (FE5) - Hole number 1 provides just over 25 increase in rate over the factory FE4 bar - Hole number 2 is 40 - Hole number 3 is 75FITMENT NOTE SB033 IS DESIGNED AS A DIRECT REPLACEMENT FOR FE4 REAR SUSPENSION SYSTEMS, WHERE THE SWAY BAR END LINKS ARE LOCATED OUTBOARD OF THE REAR SHOCKS. THIS INCLUDES 2012 ZL1 AND 2013 SS. 2010 - 2012 SS MAY UPGRADE TO THIS FE4 BAR IF REAR LOWER CONTROL ARMS AND REAR SWAY BAR END LINKS ARE UPGRADED TO FE4 SPEC. SB033 WILL NOT FIT ON V6 APPLICATION DUE TO INTERFERENCE WITH REAR V6 BRAKE CALIPERS, OR CONVERTIBLE CAMAROS.