UNI AIR FILTERS. Uni air filters are unsurpassed in airflow, dirt stopping and overall performance. The produce more horsepower and more torque than any other air filter. Uni"s revolutionary two stage air filter is the only filter that comes apart for maximum airflow and ultimate cleaning. To complete the winning combination, apply Uni oil and Uni cleaner. Additonal Fitment:1981-1982 YAMAHA IT 2501980-1982 YAMAHA YZ 4901981-1982 YAMAHA IT 4251980-1982 YAMAHA YZ 2501980-1982 YAMAHA YZ 4651981-1982 YAMAHA IT 465