Boost horsepower and increase fuel economy with a high performance air filter from Injen. Injen Air Filters dramatically improve airflow, delivering immediate gains in horsepower and fuel economy. The pleat count, filter body size and cotton gauze construction on your Injen Universal Air Filter are dyno-tested for maximum performance. The 4-ply cotton gauze element filters out dirt, grime and other impurities without obstructing the free flow of air. Best yet, your Injen Universal Air Filter is backed with a Lifetime Warranty.