I just took mine to a local exhaust shop that I have used for a few years, told them what I wanted and took less then an hour.
Now if your handy and got the tools to do it, its not very hard
Dyno numbers: 177hp/163tq
Mods: Steeda Intake, STS Kit, Rear sway bar, Lowering springs, Steeda RMM, Magnaflow catback, SCT Tune
Moderator: Third Generation Ford Focus, DURATEC Ti-VCT GDI Performance Chat & Florida regional section