High pitch, metallic ringing noise under acceleration.

[702to540]

I'm trying to locate a rattle as well. Limited time to figure it out though. Seems to only do it on cold start, during high idle. Sounds like a loose heat shield or spring or something. It's loud enough though to be annoying. Sounds like it's going to rattle apart. lol I tried to upload a video, but the file is too large. I'll try and get a shorter one.

If you look under passenger side back door there is 2 springs on the exhaust they control the butterfly valves inside of exhaust. When i tap on my on exhaust pipe the valve rattles i have not figured out how to keep the one valve from rattling

 

[itsmekylep]

If you look under passenger side back door there is 2 springs on the exhaust they control the butterfly valves inside of exhaust. When i tap on my on exhaust pipe the valve rattles i have not figured out how to keep the one valve from rattling

I’ll check it out. Conveniently, it didn’t do it today for the first time while I was watching. Lol