How much you will get on your trade will depend more on the rest of your car than the bumper. Use the Honda Civic Used Car Appraiser http://www.edmunds.com/tmv/used/2004/ho
n... to determine the trade-in value and also the private party sale value. You may be better off selling private party rather than using the car as a trade-in.
Also, when you go to buy, if you use the Civic as a trade-in, make sure these are separate transactions...otherwise the dealer may tell say you are getting a great trade-in price only to increase the price of the new car to make up for it. Read the Ten Steps to Buying a new car http://www.edmunds.com/advice/buying/ar
t... - especially Step 6 on trading in. Extremely valuable.