In order to be able to remove the air filter without removing the snorkel, I trimmed the inboard edge of the ramp back about 1/4″ so that the filter can be lifted and twisted out (as long as all of the surrounding screws are loosened.
I then used a piece of 0.032″ aluminum sheet to fabricate a filter retainer that will get screwed down when the snorkel is screwed to the ramp. I may trim this back a little further as this is more than long enough to prevent the filter from lifting.
