Default [Q] Remove su/busybox in stock rom

Hello,

I want to know if there is a flashable script ( or something else ) i could use to remove su/busybox from my system partition. I deleted my fully stock nandroid backup by mistake and it would be nice if i can make a new one from my rooted stock backup.

i used rooting tools provided here http://forum.xda-developers.com/show....php?t=2694564

Thank you.