Yes, Kooks makes them so they are extremely high quality. You will probably need a tune with them though, my Ford dealer installs a lot of them and they usually throw CELs.
Yeah, Kooks makes them for Roush so they are a good header. With that said, we can hook you up with a set of Kooks and save you a good bit since we are also direct with Kooks exhaust. Same exact product and will cost less.
If there is another manufacturer you're interested in, we can help you there too as we carry just about every brand available as well as some others that other vendors can't get ahold of.
If you have any other questions, please let us know!