I got mine out of halfords for £30 cos it was half price. To be honest i dont no why they would pay that much. The thing is the expensive kits would at the least have to be tested for fit on the car, the cheap one would not.Also do some of the filter manufacturers test them on inderviduall cars,if so that is gonna cost. Induction is more complex than it seems, i would have thought that each kit was made for each car so would myself pay the extra. However i dont no if that is right???
The difference between a K&N and a universal air filter/induction kit is like the difference bewtween buying a £10 remould tyre and a £60 michelin classic. You's soon notice the difference! (The £60 tyre being referred to the K&N).
Sure the universal ones are cheaper, but of less quality, therefore contemplating the performance. K&N filters are tested in their own laboratory to the highest standards (apparently as quoted from my K&N box).
It Is possible that the sound may be similar, but the performance may not be.