That's probably why you lost. The BOV is known to actually reduce the 1/4 ET of a WRX to about 13.1. Take that out and you will crush that Mustang, trust me!
UMMMMMMM......................no, Taking out the BOV will not enable my car to outrun a GT thats running 10 psi boost and 100 hp NOS. I may not have turbo experience, but that doesen't make me a fool. The stock BOV is plastic and it is far from great, the quicker valves on the HKS BOV reduce lag between gears so it makes the car quicker not slower. Where did you say you got your knowledge from? a RSX?