Considering one of these

ive ben told that k&n air filter are over rated this coming from someone who has 3 track cars and says that pipercross is the only one hes actually seen any difference

piper cross for fez mk6 are poo, they stick on the end on the air box, so all the restriction is still there

i like my bike filter

and the top half of the airbox is there just for show

ive herd gains of around 5 bhp from k&n 57i`s on fez st`s on rr theres lots a kits out there at the moment think there all roughly as good as each other drop paul dolan a pm he may be able 2 sort u out with a good induction kit

already fitted somethijg completely different mate. got a motorbike filter on it now