www.sonoransteel.comI just bought System 1.2, read through the site, lots of good info on 4runners and suspension.
Don't use spacers. OME is not great on these vehicles. OME parts were built for the foreign market Prada and not the 4runner. And they are overlift springs and not made for lift, despite common opinion. And OME shocks for our application have many issues.
I could go on. But I did a lot of research before I settled on what I bought. I believe I bought the best IFS lift available for these things.