My G started making this noise yesterday morning. It only does when I let off the gas and only at 2000 rpm.
I figured it was a loose heat shield but got under it today bolted down both heat shields by the cats but the noise didn't go away.

I have ART Pipes but I don't believe they are making the noise, since I've had them on for a few months now and the noise just started happening. Exhaust is stock.

It does it in every gear right at 2000 rpm and only if the rpms are falling. If I get on it, it won't make the noise.

Here's a Video
You can hear it at 0:08, 0:21, 0:30
(sorry about the bad quality)

http://youtu.be/-4QVA3gPosA

 

By

Anyone? lol

 

Did you have the windows down or sunroof open? Too much background noise to really hear it.

 

My 240 used to make the same sound but I was never able to pin point the noise until I got under the car and had someone rev it to the correct RPM. I thought it was a heat shield but it ended up being a bracket for a sensor that had come loose at the weld due to vibration.

 

I recorded with my iPhone out the window. lol
I can get a better recording but I don't think it will help.



It won't do it if I just rev it, just when I'm in motion.
I tried getting under it and while revving it, couldn't find it. Even lifted the back end off the ground and had my dad go through gears, but it wouldn't make the noise.

 

I have a very similar sound, but it only happens one time when I start it up and gas it in drive and let go for the first time. I also have ART test pipes with stock exhaust.

 

Yeah it didn't make this noise in the past. I hope is not the ART pipes.
I going to get the car on a lift this weekend and try to pinpoint the noise.

 

Maybe an exhaust mount of some sort? Get under there and move the exhaust around to see if it hits anything.