Protect any surfaces including metal

Ergonomic padded shoulder straps

Technically stronger – more Heavy Duty

5 mm to 19 mm

UniFilter - Competition II Air Filter (NU-4137ST) Options:Air Filter Protect any surfaces including metalDesigned to fit in the factory airbox UNI FILTERs high air flow, superior dirt stopping ability, and long lasting dependability have made the PRO COMP II. The bestselling replacement air filter for competition motorcycles. The UNI FILTERs unique two stage design allows for easy and complete cleaning. The outer layer can be used dry as pre filter allowing for longer intervals between cleanings, or it can be oiled for superior engine protection in