I have a 2005 Z71 ECSB and other than installing Bilsteins I finally got around to putting these bars on.
Front 7702 & Rear 7800 $509.00 shipped and well spent. Corsa SSE CatBack caused no issues.

I received the rear before the front noticing the difference as soon as I took a left out of my driveway. No more boat rock or sway. If the rear was all I was going to install I would be satisfied for the money.

The front bar arrived and what a monster. The OE is a hollow 1-1/8" bar and the Hellwig 7702 is a 1-3/8" solid bar weighing almost the same as three OE bars.

Together the bars took out 75% at moderate speeds pushing it on long sweeping interstate clovers.
They take out more in the city and you notice this immediately as you navigate city intersection turns.

Another thing I like is the remaining movement is very predictable. Before there was so much and varied widely between scenarios.

I wish I had installed them back in 2005.

 

Awesome! I have looked at adding a rear to mine as well.

 

 

After running the rear only (in the middle hole) and then adding the front I'm glad I did.