Question : I DRIVE a 2007 Proton Wira 1.5 (AT) which has done about 25,400km.
When I go through a hump, the undercarriage is hit even when I am driving alone. With two or three passengers, it's worse.
Is there a need to change absorbers ?
At what speed are you hitting the hump and how high is it ?
It is possible that your shock absorbers are worn and need replacing.
You can go back to the OEM units which will give you the best compromise.
However, if you want a harder ride there are many brands on the market that will cater to your needs, from slightly harder than standard to full race or rally specs.
I suggest that you visit a suspension shop and the guys there should be able to help you out.