I changed mine a few weeks ago to the K+N. Did I notice a difference in sound/hp/mileage....no. Actually, that's a lie, I hear a slight whine when I get off the gas.
Of course Mine's an auto cause the wife can't drive stick
But, for 60 bucks or so...sure, spend the cash. You'll know it's there, and in the really long run, you'll be ahead cause you won't have to buy filters.