Shelby drop costs all of one drill bit and some time!:smile: Roller perches are a lot more than stock, and provide smoother travel, but less dampening, so the ride response relies more on the shocks and springs.
As for rear leafs NPD, and probably others, sell Eaton's to OEM specs, just got two sets and looking forward to installing to see how it affects stance. As noted, nose high was stock, so will drop the fronts to near level...