I realize this thread is old, but figured I would share my method of removing the emblem. The front emblem was fairly easy to get off with heat and dental floss, but the rear emblem gave me some troubles. So here's what I did.
Step 1:
Drill a hole at each end of the emblem. I was careful not to drill into the bumber, only through the surface of the emblem. The holes are needed to help pull the emblem off of the car. I actually only needed one hole.
Step 2:
Heat up the emblem with a hair dryer.
Step 3:
Use a metal rod to pull, not pry, the emblem away from the car. I just hooked it into one of the holes and pulled away from the car. It came off really easy.
Step 4:
Use a grinding tool to remove the two nipples that held the OEM badge. I covered the surrounding area with painters tape protect it.
Step 5:
Clean up the area and apply the new emblem
And here are the results
