UMI has good quality
These are pretty nice leaf springs, however, I wasn't aware that I would also need some spacers to go in between the leaf springs and bottom plates. There was a gap on mine after installation and when I attempted to torque the U-bolts and perch bolts down to specs it began bending the bottom plates. I just used solid steel round spacers that the bolts fit through and cut to fit in order to fill the void and allow me to torque them down to specifications.
My Camaro also has the UMI 2" lowering springs in the front as well, but the rear squats slightly lower after installing these leaf springs. I was hoping it would sit level. THIS IS PROBABLY BECAUSE OF ALL THE ALUMINUM PARTS I SWAPPED UNDER THE HOOD...NOT A UMI ISSUE. I have aluminum heads, intake, radiator, etc., etc. I will need to do a little fine tuning with the suspension on the rear to achieve the final look that I was after. I wished that the 1.5" lowering leaf springs weren't dramatically more expensive than the 2" ones. That definitely stinks in my opinion.