I have a totally stock Formula S with the 273 commando engine
so many people have told me to get rid of the chrome and let the car breathe. I'm going to keep it original and on the engine
that is why they make holes, so they can get more air.
The thing is open all the way around the bottom. Are these people blind? It has way more flow than the typical snorkel type air cleaner. That was the whole idea.
Anyway, the lid is the same as a slant six air cleaner, so if you can't scare up an unholed example you could have one of those chromed. Oh, someone else posted that. I have the same pair, except my Commando is non-CAP and my 225 lid is.