i would buy k&n just cos i no alot of people run them on serious powered cars like a 420bhp evo and i used to run a k&n on my old glanza with no probs at all hope this helps
myself and my friends have used K&N mainly due to their reputation i dont doubt that other filters would do a good job but i have always found K&N to be quality products and great for all types of cars you just can't fault them they do their job.
hope this helps,
