New The Spectre Performance HPR3901 Air Filter is a customized air filter designed for car and truck owners looking to enhance their air and fuel delivery system. Made by the reputable brand Spectre Performance, this air filter is specifically designed with high-quality materials to provide optimal filtration and performance. The manufacturer part number HPR3901 ensures a precise fit and compatibility with a wide range of vehicles, making it a reliable choice for those seeking to improve their vehicle's air filter.