My mate showed me these pictures of coily suspension upgrades, and I have no idea what I'm looking at.
Would somebody better equipped than I be able to share what it is I'm looking at, and whether or not it's worth looking into as a potential upgrade for a coily sierra?
(In particular, that A-shaped metal bit.. and everything else)

(interestingly, Japan has a full-range of upgraded control arms for sierras, which are better suited for climbing stuff)

FWIW, he's japanese, and these are all JDM components