The Turbo II line of intake precleaners are very popular - and for good reason. They are made of heavy-duty steel, are very efficient, are easy to install, they have a lifetime warranty on the spinner, and they even look pretty. This one fits on a 3" to 4.5" inlet tube (smaller adapters must be purchased separately).
Recommended C.F.M Operating Range 250 to 350
Precleaner selection must be based on engine air
flow specifications - NOT on inlet tube diameter.