Just use a screwdriver and pop the snorkel out it’s easy to do no need to heat it up. It will lever out. And as the other lad said. The stage one (inner filter ) is just a straight swop take old one out put a DNA or k&N in ,and stage 2 is take air box side panel off and replace with a DNA stage 2 filter. I did mine 4 weeks ago ( xt660r)take 15 mins simple job. I took my snorkel out cut all the bit off that go’s inside the air box, then drilled 5p size holes in the outer part of the snorkel ( each square) for more air flow then fitted it back. That way water would not drop back into the airbox when washing the bike as I noticed water does sit in around the snorkel. That’s just what I did as don’t want water going in the airbox if I can stop it.