Loud Noise

[Blue Mach]

So today I get in the mustang to go to work. When I start it there is this loud rattling noise coming from under the car. It sounded like its coming from my X pipe. My guess would be one of the cats. The sound stopped before I arrived at the office, I will take it to a muffler shop today but I was just wondering if anyone else experienced this problem before.

Thanks

 

[TopDeadCenter]

I HAVE!

 

[03gtmustang]

Did you check all your nuts and bolts? One might be lose. If you find out its coming from your cats then Im not surprised, Bassani cats