One of the most important components of any nitrous system is a good filter. NOS filters feature an aircraft-type reusable stainless steel mesh filter element to keep contaminants from attacking a solenoid and plugging the jets. These new NOS hi-flow billet aluminum filters feature a precision 2024 billet aluminum body and a 140-micron serviceable stainless steel mesh filter element that has 10 times the filtering area of a standard filter. Our filters feature a radius on the outlet fitting to maximize flow and are available in a variety of sizes depending on your needs.