Video I didn't think was useless but here's the deal, when braking and coming to a complete stop there is a rattle/clinking noise coming from somewhere under the car.
Upon accelerating from a stop you hear it and sometimes but not often when the car is idling in drive.

The car is a 2005 Rx8 Sports 62k miles, replaced spark plugs, ignition coils, and crank shaft position sensor not to long ago. The rattling came sometime after I replaced
the craft shaft sensor.

Not so much of a mechanic so I really have no idea whats going on here.

I did a second take, but it audio of the rattling didn't get picked very much. You can hear it slightly what I'm talking about at around 10 seconds.

 

That video is useless, all I hear is you blabbering.

 

check the front end; upper, lower control arms, ball joints, end links, inspect the exhaust heat shield that tends to break and rattle. Also, inspect the under tray, it may be loose/broken etc.

Hope that helps you.