[samwise68]

I have headers, so my first through was it wiggled a bit. I can hear it from down below, as well, which leads me to think it's the passenger side collector.

I don't think a sudden jarring like that would effect the internals? There's nothing special about it - just a 307, all stock, with headers.

Thanks for the insight, as soon as it quits raining, I'll check it out. Any more ideas?

-Sam.