Damutz
There is a full range of Induction kits available for this model. If its is the sound you are after, I would suggest going for somthing like the Powertec or the Pipercross. The K&N is ok but they clog up very quickly and need cleaning on a regular basis.
If you are looking for some performance gains, you need to be looking at something like the Viper kit which works out at around £249.
I personaly would stick with a Panel filter, you wont get any gains out of the filter but you wont lose any power which is the main thing.
Pretty much every standard induction kit that has been fitted loses power, compared to the panel filter. Most of the time you think that the car is quicker, just down to the sound.
Its down to you which way you want to go.
Drop me a PM if you want some prices, as i can get all of the above mentioned through work.
Steve