You need to mount the ait sensor somewhere, therefore the stock assembly needs to be kept. We are not talking about a 800whp Supra here, air movement here is average for a boosted V6. I'm not concerned about the 'little holes' restriction as it is just and added inlet and obviously the air will come in from the source of least resistance, I'm more concerned about the air filter being squeezed between the two plexiglass plate. I'll probably make another plexiglass version in the near future as it is perfect material for this since it's extremely heat resistant.