It's your Injen cone filter. All short-ram/cold air intakes do that.naladude911 wrote:I just noticed this today. I was at a stop light, and it turned green so I pressed on the gas and it turned to 2nd at 5000 RPM. Now at that point between 4500 and 5000 RPM my engine made that whistling noise like a turbo does. Its never done that before, and every time i accelerate it keeps doing it. Whats going on? I like the noise but is it normal?