A very good choice of last stage protection ?carlston many thanks again for all useful info.
next days i order bilstein b4(front rear)+ kyb springs(less expensive compared to bilstein b3).
also bought dust cover kit and meyle hd drop link.
next step refresh appearance: remove some scratch,decontamination paint whit clay bar,and lastly auto wax(collinite 476).
at work end i open a new thread.