Yep, understand all that mate...we were talking about brakes? not a butchered airbox or induction kit. To be fair those airboxes look awful and the noise would drive me mad!!200 hp will not happen with the OEM airbox, it will choke out at around 180+ hp.
It need modification to get more air in, something along these lines.
Although it think 4 big holes is a bit overdone IMHO, more fan of more smaller holes.