I didn't notice that before. Whenever I start it up from cold start I hear the rattling noise from my tbe. But after about 1 min when it is warm up, the noise goes off. I have
tanabe concept g blue and jdm bumper.That only happens from cold start.

 

Have you checked your downpipe?

 

I haven't cuz i thought it cames from my exhaust.

 

I had an annoying rattling sound for months on my AMS TBE. Eventually it just went away. Mine was just here and there though, not all the time.

 

I had rattling noises too, loose downpipe, guess I forgot to tighten it well