Just installed them this weekend. My car was on stands for some other installs but basically you'd have to disconnect the link from the sway bar and rotate to adjust then re-tighten the lock nut.

To install, I used a floor jack to nudge up the lower control arm so I could get the link into the shock mount which was a little bit of a pain. I forgot to grease up that part of the link so I'm wondering if I have to redo the process.

How much longer can you extend the SPL end links over stock? Both front and Rear?

A good bit. More than you will ever need.

Squeaking!
 

I know I'm reviving and old thread, but I think my issue relates to the topic, so I put it here.

I just installed Nismo S-Tune front suspension and SPL Pro Endlinks. Now I'm getting a lot of squeaking when I go over bumps as well as some clunking.

Any idea what this might be? Pre-load maybe.

I'm so frustrated because it took me forever to get this suspension installed, now it sucks.

Update: YEAHHHHH! Before I left for church this morning, I sprayed some penetrating oil on one of the end links. Squeak went away. As I drove around the clunking got worse. Once I got home I put it on ramps and saw that one of the end links was badly crooked. Enough that there probably wasn't much movement possible. I also saw that the link on the other side was quite crooked against the sway bar, so I pulled that one out and extended it so it was parallel. Clunk and squeaking are now gone.