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Yes the mach 1 chin spoiler will fit the '01. However, no, it will not fit the '04. Completely different bumper. And for those looking for one, the best I found is a guy on eBay selling them for $99.00FREE SHIPPINGright to your door. I just got mine and installed it. It fits great and looks good too! I'm working on pics.
USE CAUTION tho when installing!! It's a little more difficult then I thought it'd be.