A hair dryer helps when trying to debadge. I used a hair dryer, floss, and Goo Gone. I took my time and used my fingernails to remove as much of the adhesive before using the Goo Gone. Once they were heated up from the hair dryer, removing the letters with the floss was quite easy. The only pain is getting all the adhesive off.
Snorkel Delete / K&N E2993