TWIN AIR Air Filter - Polaris 156143 Radiator Covers For Yamaha 4" muffler body uses a

4" muffler body uses a cooling chamber with proprietary technology to prevent blueing

SOUND STATISTICS

Compact design for discrete placement and easy installation

The staggered tops allow the cylinders to share the available volume of air in the R1’s air-box evenly at low and mid range RPMs

TWIN AIR Air Filter - Polaris 156143 Radiator Covers For Yamaha 4" muffler body uses aDual bonded foam design filters out even the smallest dirt particles, while allowing more airflow than two separate layer filters (flow bench proven)Twin Air filters are slightly smaller than stock to make them easier to change and to increase dead air space around the filter for better performance Flat foam sealing ring securely seats against the airbox, even in the worst riding conditions