Sprint Filter P037 universal conical air filters are produced with the P037 waterproof tissue and is a Sprint Filter patent the world's only manufacturer of waterproof air filters for endothermic engines. So any sock needs to protect the engine from humidity and rain. They can be installed by eliminating the original filter holder and can be placed directly on the throttle body and or carburetors. This configuration is recommended for extreme performance use. Proper tuning could be important. You must recalibrate the ECM when installing this pod filters.