Just thought I'd put a quick post up about this. Recently my car over last month or so has lost some power. When I first went stage 2+ the car was very impressive but had dropped to I would say was just over stage 1 performance.
I've been getting surging boost and more lag type symptoms especially at low revs. After reading various posts etc I narrowed it down to probably PCV or N75 valve.
Picked up my replacement PCV from stealers today and fitted this am. Took it for a spin and what can I say the difference is night and day. Full steady boost all through the rev range, no surging, and lag has gone. Basically back as it was. Also the idle is noticable smoother.
The interesting thing is for reading other posts I wasn't getting any other obvious signs of a pcv issue. Pulling dipstick gave rough idle etc.
I may well change the N75 as well and see if further improvements as is only 20 notes. Well chuffed car is back on fire again!