I have done the Soup Mod, but it was a disappointment.
After removing the wing nut from the top of the air cleaner, remove the lid. Do you see the large "Soup Bowl"?
The "Soup Bowl Mod" is removing this bowl. Allegedly it helps with air flow, but I have my doubts. Many will claim huge results in MPG, faster pick up, blah blah blah.
It does make removing the air filter lid much easier.
Don’t get too wound up!