So what you are saying is that a k and n filter that replaces the stock filter in the air box is no good? what about the k and n cone filters, are they any good? i just got the car and dont really know much about the diesels and what is good and what is not for them. i was also lookign at thoes pic of your car and what kind of filter is that that you are using? where can i get something like that one in Canada and about what would it cost if you know?thanks!