I should just let this die, but I can't. You realize that was the entire question and point of making this thread???????????? You are a new kind of forum "thatguy" that I have never come across before. The wait till the thread is over then come in with your answer and tell the OP they are wrong guy. Congrats on your new title
Yes I understand how suspensions work and that the ZL1 1LE is sprung way stiffer, but unless you know for a fact that the ZL1 1LE bars are a lower rate than the ZL1 bars, then you are just assuming. I think I'll take your trophy away for that actually, because once again no one actually knows the answer to the ENTIRE POINT OF THE THREAD! If you provide proof I'll give it back to you.
You are also "thatguy" who says blah blah blah factory GM did it best. We've all heard that guy too much, so no trophy there. Did you not notice I have a regular SS? I suppose you "know" that the SS bars are stiffer than the ZL1 1LE's too because my car is sprung softer too.
Heaven forbid I try something different for a cheap suspension upgrade.
"We are all sheep must follow the herd. OMG he did something different and wasted a whole 155 outrageous dollars and he now has an adjustable rear bar to tweak!!!!"
I will tell you how a forum is supposed to work. Now that I am in possession of the ZL1 1LE bars I can go measure and compare them. I will then provide (crude) data and answer my own thread for the better of this community.

I still don't have ZL1 bars to compare though, so hopefully someone else who wants to help the forum can provide me with the data for comparison. If I wasted money, hopefully I can exchange them, if not double bonus that I am showing the forum another option with actual data to back it up.
If you don't want any data I can just go post about the 18 Mustang or ask why low dust pads don't stop the car very well. Those seem like very common topics that everyone cares about.