Depends on the car. pag kasi binababaan ang ride height(lowering) tendency ng camber ay mag-"toe-in" o kaya "toe-out" in other words, improper wheel alignment. meron mga kotse na may camber/toe adjustment meron ding wala. dun mo kailangan ng camber kit.
kailangan mo ng camber to avoid future headaches , not necessarily na kailangan mo agad as soon na ni lower mo . pero for future references na magtataka ka na bakit butterfly yung gulong mo or kahit na nag pa alignment ka na ay di siya maayos , nasa cambers mo yan . if ur tight sa budget , u can get maybe after a year or 6 months to bago maubos ang gulong mo na di pantay .
based on my own experience, malalaman naman ng shop kung kailangan mo ng camber bolt dahil masyadong negative camber ang alignment. In most cases, less than 2.00" drop doesnt require a camber bolt specially kung maganda ang springs mo at hindi nag-sag. having a negative camber on the rear is not necessarily bad if you wanna reduce understeer. (refer to another thread talked about the alignment settings) Sa daily driver, -1.00 camber isnt all that bad. I have a -1.00 front and -0.75 rear