Highlight to those who going to upgrade this. After installing the knuckle I relized that the disc caliper from 3racing for D4 can't even fit on. The whole on the knuckle is totally out of alignment. From the same brand and same model can't even fit, what a failure design.
Generally satisfied but there are a few issues to make it work like it should.
First of all, only one hole (the same as the default knuckle) to the inside is unusable.
You need a washer otherwise the screw reaches the outside of the bearing.
Upper set screw shroud not be placed at the top because it touches the turnbuckle, not allowing the suspension to move freely.
finall- y, the whole steering must be altered since turnbuckles touch the inside of the knuckles, making it hard for the wheels to turn.
Something like this