The reason why I said "best" is because so far its the only exhaust that I have never heard of any one complain about bad fit, noise being to loud, high way drones, ugly/oversized tip that needs to be replaces, hangers in wrong place, etc. Their are many great exhaust systems out there.
Do YouTube video searches and find the one with the sound you like the most.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)