Engine Rattling noise

when i accelerate it makes a noise like a paper hitting a fan the more you accelerate the louder it gets.
i checked the engine and the problem is that there is a pipe that is not connected
it is right in front of the engine, next to the gray cover. if anyone nows wat that metal pipe is called or how much u think is gonna cost i'll appreciate it a lot.
thanks in advance
http://www.t-mobilepictures.com/photos/photo28/5a/07/ab0a223dd281.jpg?_rh=3lu4jha41w3iiqq7uina1hu35http ://www.t-mobilepictures.com/photos/photo29/23/d4/9924cf3678ea.jpg?_rh=74747ogfdxdebsvaym1hpv13b

you better take a picture and update here..different engine different orietation..if have a picture make me easier to identify

that i believe is your egr pipe, cars really dont need it so if you can find a bolt to put into the hole on the exhaust manifold your car would actually run better.
but i dont know how much ford would charge to repair/replace it

yeah, that def. looks like the EGR. you will throw a code if it's unhooked/leaking. I'd go to a junkyard and pull one off another focus. Make sure you ask them if they hvae any with the SPI engine first.....