You see. caterham7, most owners of s/moto's or big singles such as KTM / Berg's Husky's drill out their air box panels to allow a greater intake of air, DNA designed one specifically for our bikes which works wonders and at the same time it includes a filter which help cleaning said air intake.

I do declare that the DNA 2 is the best mod anyone can do on our bikes and immediately tell the difference, it does give u a few extra ponies too!! try it, you won't be disappointed.