[cdog]

If you are doing limited driving in the car, maybe you don't need filters. If it's a '500-1,000 miles per year' car, just run the Webers and screens. By the time dirt particulates entering the horns actually accumulate enough to force a rebuild, you'll be long dead.

Based on what I've seen, there are MANY engine components that will fail long before the dirt causes an issue, especially in a high HP side-oiler. This assumes you don't live down a 10 mile dusty country lane...