Nope. haven't seen any compelling data to change an air filter (and probably won't care under warranty). I'm not going to chase HP gains with this car. My wife and I drove about a hundred miles yesterday across the Hudson Valley on some fun roads and I never came close to having more road than power. For me, this really is the spiritual 2nd gen NSX that just leaves me craving more time to be in it.Nice, did you also add a k&n?