I just got a K&N air filter today, i have not installed it yet. i also got my ducks cover coming in, they should be in tomorrow or monday at the latest. Anyway what i wanted to know is there really a big difference in the stock Vs the K&N filter? Has anyone done any testing? I figured before i install i would run the 9 at maybe 3 1/2 - 4rpm in 2nd, 3rd, and 4rth and shoot the coals to her and see what it does. Then come back and put the K&N air filters in and do the same. Then come back and put the ducks air covers on and do it. So what you guys think? Do you think there is a big difference????:dontknow:???