Reviewed By Philip D (Lebanon, PA) Reviewed for a 1987 Ferrari 328 —5/22/2009 5:11 AM
If you look on the K&N box, you will see that if you have a flat filter, it is already pretty good and the K&N doesn't help much. The K&N is most useful if you have a round or cone filter. In my application with a large flat filter, I didn't notice any difference. It is still nice to be able to wash and re-use.