Good extended explanation above. And to paraphrase member Gary Allan (rip) on the topic, 'true' racing filters are 'basically sieves'. Suitable/appropriate for track use, for extended street use, not so much.
Now, Ford makes what they call a 'Racing High Performance' filter', that is quite efficient and quite well made with very stout construction (thick can, heavy baseplate). While it has Racing in the name, I would consider it a street use filter especially appropriate for use in vehicles with high performance engines.