HPI Baja 5b stock filter unit with stock foam or the TGN RedNeck ONLYThe new TGN filter cap is made of solid billet aluminum. Adds a nice clean aftermarket look to your great working stock filter. For an added feature we have machined in a small grease lip inside the cap to help further seal the cap against the filter. This is called a grease lip because experienced off road drivers will take grease or petroleum jelly and put it between any a surface your filter touches, thus eliminating any area the dirt can enter your intake. A must for a fully equipped Baja. Choose from these colors, 2288-RD=red, 2288-BL=blue, 2288-PU=purple, 2288-SV=silver, 2288-OR=orange, 2288-BK=black TGN FILTER CAP ALUMINIUM