Injen SP1390P Polished Finish Tuned Air Intake System Designed using Injen's patented MR Technology process for the greatest horsepower and torque gains while maintaining a factory safe air/fuel ratio Aerospace quality aluminum construction to save weight and improve corrosion resistance TIG welded hardware and adaptors for maximum straight Constructed of surgical cotton gauze the filter element comes precisely oiled to maintain consistent airflow and prevent obstructions to the intake system Backed by Injen Technology's limited lifetime warranty