BTW Funked, a kid was runing a WRX STI ABC XYZ 123 R at the track. He had a funy sound everytime he was shifting, something like a loud "Pshhhhhhhhhht".
Does it has anything to do with some kind of turbo relief valve?
(kid put 4Gs in the car, said usually ran 13 secs, but this day he ran 14.68.)