imho, trd brakes would be a waste, unless you guys track... the kluger brakes seems more worth, just paint it red and add some decals if you really wanted lol... why not get some braided lines for a more sturdy feel ?
2nd this ^ not sure about gen 4s but in the gen 5, pre face and facelift clock springs are different, maybe try looking for preface one and check if its the same ?
of course, its a machine, were you expecting everything to work in your favour forever ? leaks/blocks in lines, compressors not working ; two of the common things that ive heard happen
1.engineered = legal not engineered = not legal its illegal if not engineered bcoz straya; nuff said 2. DIY 3. 4k+, dont forget you gotta put moneys aside incase lines get fckd, or some other bs happens