This design was made specificly for the aftermarket billet filters found with different names on them manufactured by ADA. They are used on the HPI baja 5b, SS, 5t, 5sc as well as many other large scale cars and trucks.
When TGN aproached DT1 we asked them to make the filter as larger in diameter than the stock foam. We know the stock foams are a little loose so we wanted to correct that and and make sure there is no open area for dirt to get in the engine.
Come with 3 layers of protection for high flow but ultra filtration.