Hey guys, i own a 1996 r33 gtst for the past 4 years. It has a 3 inch exhuast and front mount but apart from that is a stock car. Recently i have been hearing a whistle noise coming from the engine (trying to source where it is coming from it sounds like turbo or pod filter) doesnt matter if it is warm or cold it is always there only at idle.
Since it started the car has also began to flutter. Not all the time but if boost isnt fully built up it flutters when letting off the throttle. The bov is stock and has not been blocked off.
I have checked most hoses for leaks and havent found anything. I am completely lost as to what it could be and cant find any threads that explain this at all.
Thanks for any help.