The DNA Stage 2 which is fitted to the side of the box is the one that gives you more performance and it is also a filter for life if you buy the DNA regenerating kit it has a bottle with the cleaner and a spray that re-oil the filaments / waves.

The OEM its only good for 8'000 miles MAX and should be changed now we also recommend you get the DNA equivalent of the OEM because it is designed and proven to have more performance and once again with the kit you can have it for life, just clean it and re oil every season, depending on the amount of riding you do through the year.

Here is the kit you need
https://www.tpl-parts.co.uk/product/...MaAlTTEALw_wcB

Here is the DNA filter you should get to replace the OEM:

https://www.e-dnafilters.co.uk/produ...gaArR7EALw_wcB

And here is a video on how to clean them

https://www.youtube.com/watch?v=QmDCrdMvAsk