I want to to know which model of K&N filter is suitable for 1985 old styled Maruti_Suzuki (800 CC)car?
What is an approx cost for it?
What will be the difference in performance, fuel efficiency, pick up?
What will be other desirable/undesirable changes to the car?

I tried to find out the about the model on K&N site but they have not listed Maruti on it. Secondly they have not replied to my mail.
So I am asking these question here.

Please help me. Thank you.