Thats correct, you will not need to use your Daystar atleast on the front. They work kind of the same way the spacer does except instead of preloading the spring from the top, there is an adjustable clip at the bottom that preloads the spring from the bottom up. Hence the 4 height settings you can pick from. Sorry if thats confusing the way I wrote it. If you do get the 5100s, depending on the setting you put it on, youll either need to keep the rear spacer in or get lift springs to keep it level. The rear 5100s do not lift. There are alot of good threads on installing them. I just did the FJ/5100 and love it.