I ran the car down the track and tested a few things last saturday. First off i found the filters with filter tops to be slower than the velocity stack with a screen lid. Ran a 6.60@105.89 8th mile. 6.544@106.30 with stack and a screen lid. 6.541@106.33 with stack and no lid. So, the screen is not really hurting enough for me to run without it.