Please help me identify this sound. I do not notice it while the car is above 2k RPMS...however...sometimes, when the car is idling, it sounds as if the hatchback area is being subject to large gusts of wind. That is the best I can describe it. I believe it is coming from the exhaust. Any help would be greatly appreciated. I have a 97 z w/56k miles and I had flows installed last month, a week before that I replaced two fuel injectors, and a week before that I installed a K&N filter (the day I purchased the car). This noise started to days ago. Also, sometimes during acceleration I have hear what sounds like very faint "crackles" coming from the exhaust as well. These two sounds started around the same time. Any help would be greatly appreciated. Thanks -=Tommy=-