I noticed a 10-15F degree change in ambient temperature reduced my gas mileage significantly.so I bought this car with the MANN filter, which has some weird soft stuff that actually helps prevent pollen and dust from entering air chamber. I just installed the K and N drop in air filter. I immediately see better results in performance and even gas mileage 3 mpg increase. Is there harm in using the K and N over the MANN that helps prevent more tiny particles from entering. Which is best to keep my car running smooth for the long run?
because of the internet, every idea you can come up with, someone/many have thought/done the same thing and posted results, good or bad.SO the k n filter does let a lot of particles pass. This study did not include the MANN filter. You saying I should not use the K N filter anymore? I just bought it