3 Racing Sakura D3 CS Drift

Ok I'v just read this whole thread lol hahaha I'v been drifting for bout 2 years now and I'v learnt so much reading this, I have a few questions now! Whats a KPI mod? bump steer? I have a few modded chassie myself, and understand that the sakura mods ya guys are doing is to create more lock, I struggle with a type of dyslexia where names and terms take awhile to sink in and I cant recall things I'v learnt, Please excuse me if i ask the same question

Do the mst knuckles work with the stock c hub or are they deleted so the knuckles can be used?

I've done the KPI mod and the chub delete using MST knuckles with R31 cvd's.. I'll get you pics later today::