Oh yeah, don't forget to take out the headers, exhaust, and such. Don't forget to get rid of the sunroof and power seats along with all the other power motors, but leave the windows in, so you don't have air going inside the car to slow you down by creating drag. That includes the antenna mast, as well. Also, the speakers. All of them. Its the little things that count ;)
PS, dont forget the mirrors!