Be very careful how far and hard you hit the guards on a S13. They'll pop in over the bodyline crease above the guard and then they're fucked.
I just hit them fairly firm with a plastic faced hammer and a block of wood wrapped in a couple of rags, and heat it up with a heat gun.
Havent cracked any paint or creased any guards yet.
You will crack the paint inside the guard, but just paint over it in some satin black paint to seal it again.