That's because dyno results have proven that the Uni Filter produces more horse power and more torque than any other air filter. Uni's unique dual layer design provides higher air flow and better engine protection, and they're cleanable and reusable.
The instructions for soaking the filter in oil were a bit confusing. I couldn't understand if both sponge elements should be soaked, perhaps a picture with the filter. Otherwise will test it and it appears well-made and good quality.