[Tommy]

I have run the K&N Filter top on my car for more than eight years. I've never done a side-by-side test with a regular top, so I can't offer an objective evaluation of that matter. However, after my last engine rebuild, I did tune the carb jets with the filter top and it runs fine with air from the scoop blasting down from above. I'll add that as an aerospace engineer, it's hard to me to guess what the airflow under the air filter might look like. It would take some serious testing or major supercomputer calculations for anyone to really know, and it would likely be different for each particular engine and set of conditions. ... All in all, I agree with Mr. Kirkham.