I have searched the forum on this issue and found that this may not be an issue to worry about. Mods: AEM CAI and catless down and HPT tuned. I only get this flutter at cruising speed on deceleration. After moderate to hard accleration, it sounds like I have an aftermarket B/V(normal). I notice when i use the stock intake tube (turbo to CAI pipe) this flutter is much quieter and almost nonexistant. I recently installed a ZZP upgraded intake tube on the AEM and noticed the flutter is louder than ever. I also noticed that that you can feel the car stumble when it does this (light accleration only). Moderate to hard acceleration the car runs flawless.
Any thoughts would be welcome and thanks in advance.