Some states have lays that state that you cant dump your exhaust under the occupied section of the vehicle. Since the Focus is all an "occupied" space, if your state has a problem they may call you out on it.
Also not to mention you have air vents in the trunk on both sides, the driver side air vent would most likely allow exhaust fumes to enter the cabin even more so when at an idle.
at the vary least after cutting it out, route some flexible pipe out the back or have a shop bend a piece should be in the 20-30 range for a small bent section. Then use an exhaust clamp to tighten it down.
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)