well i cant speak for the focus, but we got a set of pacesetter headers on my cousins 1990 eclipse and they were fine i mean the BUILD QUALITY SUCKED! but hey they did there job if you want to win shows these are not the headers for you ...........if you want to just race and have some fun with the car without emptying your life savings on 5 lbs woth of metal go for it!
p.s they come black, now this black will ware of to a **** color withing 1 day of driving , her is what i recomend you do,
go to a auto part store and purchase HIGH TEMP PAINT any color you want--- sand off the black coating it comes with and give the header like 4 coats of the high temp paint it will look nice and work well
but since your getting an exhaust and not a header who cares no one is looking down there anyway! get it