I am experiencing a loud noise inside my car when i drive past 60kph.
I was wondering if its the engine since Ive got an aftermarket exhaust and a test pipe.
I went back to stock muffler with the test pipe, it sounded more quiet but when I drive above 60kph, the same noise occur.
I then suspected that it has to do with my tires or any components in there.
I drove on an open road, reached the speed where noise occur and turned the engine off, loud noise is still there then it faded as i slow down.
I am suspecting that its the bearings that's causing road noise.

What do you think could be the problem here?

Thanks in advance..

 

Which model Jazz do you have. The GDs had a bearing failure problem. Are your back windows closed all the way when you hear the noise?

 

Mine is a 2007 GD.
Windows all closed, noise seemed like coming from engine, hard to distinguish before i had the stock muffler back, but Ive been running on the test pipe plus the aftermarket exhaust and its just now that I encountered this problem.
Having the engine off while running 60kph made it more evident that the cause aint the engine/exhaust.

Gonna have it checked tomorrow. Thanks for your reply

 

Check your manifold heat shield. I'm thinking it sounded louder when you had more vibrations with the aftermarket exhaust and a bit more quieter when you switched back to stock.

 

Will check on that too. Thanks for your advice.
Since I still got the noise when engine turned off at around 60kph, I also suspect that the wheel might be a bit out of balance, so I'll take that in consideration as well. Hope I can have it fixed soon! Thanks to y'all

 

took the car at the service center, did some test drive and lifted the car.
apparently it was the wheel bearings causing the noise.
Issue resolved. Thanks a lot

 

It sounds like the bearings, my friend had one of the doctor type stethoscope and we used it to isolate the sounds and change out the rear bearing. It was a straight forward job and not too expensive.