DNA Air Filter P-K4S18-01 (18-24) for Ninja 400 One of the best features of the DNA Air Filter P-K4S18-01 is its ease dna-air-filter-p…24-for-ninja-400/ of installation. The filter is designed to fit directly into the stock airbox without the need for any complex modifications. The installation process is straightforward, and with basic mechanical knowledge, many riders can install the filter themselves. However, if you are unfamiliar with working on your bike, professional installation is always an option.
