Thinking of upgrading the stock Air Cleaner?
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Cold Air Intake
Cold air is very important. Instead of hot underhood air, bring in cooler fresh air from outside. It makes a big difference, and is a nearly free -- no "intercooler" needed.
Ram air. Use a mini-shaker hood scoop. Plumb it to the carb. Not only will it bring in cool, dense outside air, but the scoop shakes at idle. Cool!
Custom air cleaner for Hitachi carburetor
top hat for Weber 32/36
Open Filter
An open filter supposedly lets the engine breathe with less restriction, and therefore gives you one to two additional horsepower.
Top lid replacement supposedly lets the air filter "breathe" better
Lynx Ramflo open element for Hitachi carburetor
open filter element for Weber 32/36
Open filters for Hitachi Twin Carb
Vanette Air Cleaner
Nissan Vanette with A-series engine uses a Hitachi carburetor top-hat and a remote air cleaner.
C120
C22
C22 Vanette air cleaner on 120Y Hitachi