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Hi there fellow forum people. I have an FG XR250 turbo ute with a growler intake, a three inch exhaust from the turbo back and a turbo smart BOV that has a blanking plug to stop the shhhhhh noise on lifting off the throttle. The car is very quick and I am trying to make the car more refined, sort of a stealth car and one of the main issues I have is part throttle noise from inside the cabin. For example when you are briskly accelerating, just squeezing the throttle and the rev range from 1500 to 2000 starts to sweep by I get a very hissy, rushing , leaking air noise. On hard acceleration all sounds as it should with a high pitched compressor sound from the turbo when it's spinning hard but it's the low range lazy turbo boost that sounds totally wrong. Is this a normal sound from the car or should I be looking for leaks in the pressurised side of the intake? Could the noise be caused by the open style of the growler air filter? Any feedback would be welcomed, I used to have a Subaru WRX and it did not sound like this at all, more of a very efficient and tight sounding turbine whine with no hissing noise. Maybe it's an issue with the design of the whole intake system and I need to replace it with an after market system. cheers lewis
