(Recommend listening with headphones or sound system with sub-woofer)
This is what a worn front sway bar bushing sounds like from the cabin in a mazdaspeed3 going through bumps. The DEEP THUDDING SOUND is the sound it makes.
To verify its the bushing, safely jack both front wheels (or back wheels) off the ground and grab on to the sway bar around the wheel well and start shaking the sway bar. There should be no play. Dont use the end links to check for play.
Another way to be more certain is going through uneven bumps should make the sound more pronounced then even bumps straight on (going through a speed bump straight on)
In my case the front driver side was shaking more than the passenger side. You must jack both sides, jacking one side is useless because the sway bar will be under load and shaking it wouldnt be obviously evident.
After I replacing to an stiffer aftermarket bushing, total silence!
Car has 54k KM on it but often driven at the race track.
