Should probably post this in the drifting section.

I Have their FC angle kit, I think it's pretty good. I haven't had any other modded knuckles but these have much more angle than stock and nothing has broken.
The ball joint extensions require S4 arms, the kit does not come with new ball joints.
The tie rods and ends are a significant upgrade from the stock toothpicks, and yes they share an outer thread pitch with s14 which means heim joint options etc.
Turn in is so much faster lol. From centre small steering inputs aren't very different but the first time I went to initiate I cut the wheel like I normally would and I was instantly backwards. There was a learning curve. Also 0 ackerkan was new to me as well.