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 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)