Is the sound like ko ko? this can be the absorber, mine is like this, last time I change to APM but about 1 to 2 months time the ko ko sound will come, go back to APM service than no more sound. but 2 months later come again, so now I used to it even jam too. The WHL factory is big too, more than 10 over years, last time my Daihatsu also using it, but that time call Top perfect. Also doing over sea market, even Hong Kong car magazine I saw WHL product.
If the sound come from the bush than change all the lower bush, RM 200 can be done.