the downfall to buying your body kit pre-painted is the simple fact that your cars color has a slight possibility that it wont match that of the pre painted color. Do you park your car outside? you might have fading. Do you drive in cold weather where they use salt on the road? you might have fading. Do you live in hot areas of the USA, like Florida and Texas? you might have fading. And how often do you wax your car? the new pieces might be a lot more shiny then your car.
...just a few things to think about when trying to save money by buying pre-painted parts.
When something just looks too good to be true - check out all the angles before diving in.
...If your car is within the first year, if you wash it about once a month, you keep it in the garage most of the time and you dont own a "carbon blue" colored celica - then I say GO FOR IT