Fantomex26,
You basically have a choice of four brands for a dual out header on a 200. Clifford, Pacemaker (Aussie import), Hooker and FSPP. Mike at FSPP carries the Pacemakers and his own FSPP design. The hookers are good, but they tend to be rather expensive and hang down lower under the car. You may also want to consider the coatings as well. I believe all of the headers are available with ceramic coating. It adds to the price, but looks great and from what people say, it stays looking good for a long while.
Also, if you are going to install a dual out header, you should also install a Clifford port divider in the head. Exhaust ports 3 and 4 on the 200 log head are siamesed, and to get a proper seperation for a dual out should be seperated. It's only like $14.
Here's a picture of a head with the port divider installed. Notice that the large opening in the center has been filled to make ports 3 and 4 both seperate and the same size as the rest of the exhaust ports. This is Mustang_Geezer's head.
Alot of folks here who have installed a dual out exhaust have also installed an H or X pipe as well. It helps to balance the exhaust and many people say it makes it sound better.
Here's an example of an X pipe installation. This is wsa111's (one of the members of this site) system.
Mufflers are another concern. There has been alot of discussion on which are the best mufflers for for the 200, and alot has to do with what kind of sound that you want out of the system. Probably the single most popular muffler is the Flowmaster 40 series, although they do tend to be a bit noticable in the car when you drive.
Kris