So i'm busy sourcing some H&R ARB's front and rear and i plan on fitting these either with KW v2's or Bilstein B14. Im also considering doing the front control arms as well for the superpro ones. Given all the above work requires some deconstruction is there anything else that is worth changing whilst these parts are going on? Any bushes to replace whilst its all off? Any draw backs of using polybushes? Also I have a knock from the front that my mechanic couldnt really identify but assures me its not steering rack and suspects, as i do, that its tie rods which will be replaced when the ARB's go on. Im wondering if it could also be the subframe shifting slightly and would the Tyrolsport deadset subframe kit be of benefit and is it an involved install or easily done in the process of fitting the front ARB? Any assistance would be appreciated.