When i turn off my car it has this weird shaking sound. Kind of like maracas. flex pipe maybe? but what is rattling in there?

 

If you can get under the car and have someone shut down the engine, that can help isolate the sound.

At one time, in my cars life, I remember having to tighten up the mounting bolts on #22 on the link below because of rattling.

Acura Parts @ AcuraOEMparts.com - Genuine Acura OEM Parts from Delray Acura

It could be the converter, as well or its shielding?

 

i dont think its the shields because its not tinny sounding like with my accord. good idea about having someone help. maybe i need a stehascope lol. the noise only happens upon shutoff. not at idle or any rpm... Ill check what u suggested tomorrow though. thanks for helping!