Tweety uses a cold air system starting from the 38/38 carbie weber top hat with a 75mm expandable snorkel to a large cone sports filter. Unfortunately these cone filters arent that good for filtering air but keep the large bits out at least.

Inside the cone filter I have one of those trumpet filters (that takes care of the minute dust). A electrical zipper around the middle of it allows it to stay in place by bulging both ends.

There is a angled Poly connector with tie wire to make sure the minor filter.
doesnt get sucked along the snorkel.

Finally, use K&N air filter spray on the outside of the cone and inside the trumpet filter. After Tweety's 1500 km trek NSW and VIC it was disassembled and truly, there was no dust or debris inside the snorkel at all.
