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I had that awful fluttering noise too, it sounds like leaves rustling or air puttering coming from where the header is. It was apparent when the windows were down and driving next to a wall. I have the Open Flash Header 3. I'm not sure if it was an exhaust leak or it was because of the thin walls of the header so I tried to take care of both. I went back under my car and swapped out the stock header gaskets for grimspeed ones, used permatex copper on the gasket for the overpipe to header connection, used permatex copper on the overpipe to front pipe connection and finally DEI titanium wrapped the headers and overpipe. After all that, the rustling noise is gone. It sounds like a tight closed system now. The sound in general coming from the header is much more quiet now but still has that nice deep rumble, sounds more mature to me. I can enjoy my car again.
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