Universal Tapered 3-1/2" (89mm) Clamp-On Filter AF2711-0920 sR20 kit O2 Sensor Weldable Fitting Bung

O2 Sensor Weldable Fitting Bung and Blanking Plug M18 x1

and they work by increasing the fuel's resistance to knocking

billet aluminum construction

You can even crank the pressure up to 8 bar and they will be comfortable

Universal Tapered 3-1/2" (89mm) Clamp-On Filter AF2711-0920 sR20 kit O2 Sensor Weldable Fitting BungAeroflow Pod filters are manufactured from a high temp Polyurethane material that will not dry and crack over time. Featuring an aesthetic 4 layer cotton black design, these are perfect for any aftermarket applications. With increased air flow, these Aeroflow Pod Filters are designed to increase performance. These filters are reusable washable, hence saving you money and protecting the environment. We have the newest technologies in air filter