For Lincoln Navigator 3.5" Stainless Steel Pipe+Filter Heat Shield Cold Air Intake System - 1st Gen UN173 Made of high quality stainless steel material for strength and durability Lightweight high air flow racing performance spec. design Helps engine to draw in more and colder air resulting in better throttle response and higher explosive horsepower output Improves up to 95% filtration efficiency Increases 5 to 10 horsepower, 6 to 8 precent of torque, and improve the gas mileage