I posted this question on my local forum and got responses about what springs to buy. I am not trying to figure out what brand of spring to buy. My question is this:

I have an EM1. I have Koni adjustable shocks. The ones with the 5 perches. I am looking for about a 2.5-3" drop. My question is this:

Would I get a better ride from a 2.5" lowering spring on the Koni's with the perch at the top?

or

Would I get a better ride from a 1.5-1.9" lowering spring on the Koni's with the perch at the bottom?

Once this question has been answered, then I can decide on the springs to go with. I really do not want adjustable coilovers, so please do not suggest going that route.

 

The lower perches are not designed to be used with lowering springs. You won't have adequate spring rate for the total drop.

The lower you want to go, the stiffer you need the springs to be. A good lowering spring is designed with this in mind. Taking a mild drop lowering spring, with a minimal rate increase over stock, and lowering the car further through the perch, will leave you too low for the spring rate (you'll bottom out).

Honestly, get GC threaded sleeves. Figure out what height you want, buy an appropriate spring rate for that height when you buy the kit, set height once, align the car, and call it done. This leaves you the ability to raise the car in the future without buying more hardware, should you want to. Otherwise, just get the springs that list the drop you'd like.