...real K&N test... I took my 65 Nova, 383 stroker, 420+ hp and ran 12.95 and 12.96 in the 1/4 mile with a almost new K&N filter. Then I dropped in a very dirty Fram paper filter (same size) and ran 12.92 and 12.93. The K&N filter actually slowed me down. I'll never buy one again...
Rick