TGN Dual Stage Pre-Filter (also know as the RedNeck) All stock filters found on the FG MT-5 and some on road cars. Will also fit many aftermarket filters (K&N style). The new TGN dual stage pre filter is a must have for all serious off road drivers. This filter allows you to run the stock air filter and foam element (know to be the best option in the industry) at the same time giving you that extra protection needed when driving in dirt, mud and sand. For best results the pre filter should be oiled down with a foam filter oil.