I get an annoying knocking/thump sort of sound from the rear passenger ( rear left ) when going over speed bumps at low speed.
It is worse when cold. No rattles at all just a one-off clunk/knock from the rear.

It sounds like something in the trunk/boot moving around.

Replaced the shocks with KYBs and replaced top mounts too, no luck

Anyone else get this ?

No play in the drop link. antiroll bar etc and I have lubricated every bushing

Mazda 3 2017 UK Sport

 

did you check the integrity of the engine's belt ?

 

The noise comes from the rear, not the front.

 

had shocks, top mounts, drop links, sway bar bushings and control arm done but noise still there at the back.