not to rain on your first attempt and good job but unless its sealed better I don't think it will do that much. Get a fiberglass repair kit and mold that to get a 100% seal and will likely work a lot better.
Edit: Also looks like you still have the air box resonator on... you may get some improvement by removing that and also will give you a "better" sound.
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)