Drag racers don't use a filter because the track is clean and the air around the track should be pretty good, there shouldn't be people on dirt bikes going the length of the track spitting rooster tails along the track.


use a filter on your car because, you don't have a clean track you are on a road, and it doesn't take much of a rock to go into the carby and bend a calve or have a bunch of sand go in and damage your bores.....