Does it make it higher?
As Mike_JK_Houston_711 said, your ride height is determined by your coils. Long arms only correct your suspension geometry.
Also noticed on some upgrade kits that there's 3 arms for the rear? I'm talking RKs upgrade kit with the rear link.
A true triangulated 4-link or even a tri-link setup would give you nice bind free articulation and would allow you to eliminate your track bar. What you're seeing is a kit that still requires the use of a track bar and there for is simply a kit with one less link. Being that I have personally seen control arms and their mounts fail, I personally like the power of redundancy. Break one of 4 arms and you can still drive off the trail. Break one of 3 arms and your up a creek without a paddle.