I have yet to hear ANY exhaust on a Focus zetec that I like, even all the setups I've gone through, I hate.
Either too loud or drones or sounds like a wet fart.
Honestly, the FSW Stealth setup is closest to what I'd call the optimal sound, or lack of.
A good system, IMO, will consist of a big resonator and a quality muffler (not Mangaflow). Removing either component makes the car too loud or too raspy.
OH, you're not playing dumb ...