Chevy diesel engines are usually fitted with an air cleaner that looks similar to the type fitted to Chevy petrol carburettor engines. This type of air cleaner will require modifications to allow it to be used with a snorkel. To over come this problem Marks 4WD Adaptors now manufacture a cast aluminium hat that takes the place of the GM air cleaner. The inlet takes a 3 1/2" hose and will fit directly to a late model Toyota air cleaner hose, should you have an early model air cleaner with a 3" outlet a rubber adaptor hose can be used. These parts can be purchased separately or as a complete kit.