hey lads just wan t to ask to see if i understand this right!! i have had problems with an air leak for near a year. everything has been changed(and i mean everything!!)i have upgraded the dv spring but was wondering if it could be opening at the wrong time then losing pressure?! sometimes when accelerating on half throttle i can hear a tss tss tss sound very quickly and when it does this it runs bad! i have changed the n249 valve but was thinking if i bypassed completly then it would take it out of the picture so shouldnt open the DV at the wrong time. if i do this also should i put in a softer spring to start. i know this has been covered i other posts but i just want to make sure before takig this out as not as mechanically minded as some! the cars running about 13psi of boost and is on the blue spring but still hear the noise and def no leaks, thanks!