This really should be posted in Exterior mods.
If the speed is like the rest, the only emblem not glued is the flying M on the trunk. But, I'm kinda guessing on the speed.
on the speed6 the mazdaspeed6 is 2 sided taped on, just use fishing line to "cut" the tape, then use goof off to remove the residue that remains. As for the "M", it's taped AND riveted. On the backside there are 2 rubber/plastic grommets holding it in place. If you do remove them, you will have to fill the holes. If you are painting them, be careful when removing the M. I broke off one of the pins when trying to get off the grommets. I just siliconed the one from the inside... It hasn't moved in 3 months...