Sorry mate it is, all the open filter designs aint too clever. The full Forge is the only true cold air intake but i found i lost a bit of throttle response and the low end didnt feel as instant but it did smooth the power curve a bit and sounded really nice. When i changed to the Dbilas it felt real good, throttle response was sharp and the car felt very smooth and more torqy. Another thing i love about the Dbilas is that when you come off the motorway even after driving it hard the pipe and airbox are still cold because of the cold fresh air only being taken from the stock opening which is in the grill, i have even built a little scoop in the grill to dedicate even more air to it. The Dbilas only has two bends and the shortest length and still sounds good (if any one thinks it does'nt, stick the stock box back on and the car will seem silent), to me the Dbilas is the only true replacement for the stock airbox, it gets rid of the bad things, introduces no downsides, truly stays cold on a nice run and gives a brilliant ram effect, especially with the little scoop.

300 bhp m3 evos eat my dust!