Source google image: https://ae01.alicdn.com/kf/HTB1mvqdSpXXXXbpXXXXq6xXFXXXB/Air-Filter-3-76mm-Air-Intake-Filter-Height-High-Flow-Cone-Cold-Air-Intake-Performance-AF001.jpg_640x640.jpg
K&n filter aliexpress
Source google image: https://ae01.alicdn.com/kf/HTB1mvqdSpXXXXbpXXXXq6xXFXXXB/Air-Filter-3-76mm-Air-Intake-Filter-Height-High-Flow-Cone-Cold-Air-Intake-Performance-AF001.jpg_640x640.jpg