for a "spoiler" i would go with a roush, which ties in the theme of your car a bit better. the cobra lip looks nice too, but im not sure how it would look on your car. I got my roush spoiler on ebay, brand new, and painted for $150...its authentic and it was perfect.
http://cgi.ebay.com/ebaymotors/ROUSH-Mustang-Stage-3-PAINTED-Yellow-Wing-SM99-1530-B7_W0QQcmdZViewItemQQcategoryZ33638QQihZ019QQitemZ290044055286QQrdZ1
contact seller and see if they have any painted 01+ 4 post ones. That is who i got mine from.
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