Exhaust Rattle - 2008 GS35X

[Banker7727]

Could use some input from other G owners. I drive a 2008 G35x (auto transmission - all stock) with 15.5M miles on it. Noticed what sounds like an exhaust rattle. Taking off slowly from a standing start and at about 20 MPH and 1,800 RPM I hear a rattle like chains inside a metal bucket. If I step on the gas and increase my speed and RPMs, the noise goes away. I tried replicating the noice with the car in park and getting the RPMs up to 1,800 to 2,100; however, could not replicate the noise. I'm wondering if it is one of the heat shields on the muffler that just happens to rattle slightly at that speed and RPM. Any thoughts??????

[suby01]

thats your catalytic converter perfectly normal on our cars. it can be a little annoying but i got used to it. and kinda liked the sound after a while.

[greg_atlanta]

I was told it's the exhaust resonator, I notice it on higher RPM upshifts from 1-2 and 2-3 (where the RPMs drop off quickly on an upshift). Esp. noticeable in a parking garage!!!