I recently put an AEM Cold Air Intake on, Drove it for a couple weeks with no issues. Installed a GFB Blow Off Valve last night and the CAI starting to make a flutter sound when you let off the throttle. Removed the CAI and the flutter went away. Anyone have any idea why the CAI would flutter. The only thing I can come up with in AF Ratio increased after installing the BOV. I am running a COBB Stage 1, 91 Octane.