I just installed the air filter. I have an 2004 coupe with 9000 miles. I am not sure, but I feel that the car shifting in sport mode is smoother, but does not "pop" like it did with the stock filter. I was just wondering whether anyone else has had this feeling. The sport mode shifts now seem "longer" than before, but still shorter than the "normal mode", especially when I do not have the accelerator down on the floor. I was told that the shift timing has nothing to do with the air filter and the filter should make it feel that I have slighly more acceleration. Please lend me your opinions and comments.