I also have the wizair, and it works for me. No engine heat in my box at all, and is 1000 times better than the slp unit I had. plus it was something that I could polish. I think that once the car is moving that it flows better than anything, and that includes the fenderwell kits. The wizair pulls air from not only the fender but also from behind the light area. It also has a shorter distance and straighter shot at the TB. My .02