easy fix, go back to stock intake or replace it with something else. My AirRaid CAI made a high pitched sound as well. For some reason, some aftermarket intakes cause that sound and some dont.
Last: RUCON - 2008 Rubicon, Silver 4Dr, Auto, RC 2.5" Lift, Superchips, Rugged Ridge Snorkel, Schrockworks Rear Bumper, Custom Front Bumper, Smittybuilt XRC8 Winch, KC SlimLites, Raptor Lined Fenders/Grill/Bumper/Hardtop
First: RECON - 2008 X, Flame Red 2Dr, 6 Spd, Trailmaster 4.5", 37 MTRs on 17" XD Addicts, Hypertech Programmer, Air Raid CAI, ORFab Front Bumper, KC SlimLites.
US Army (Retired) - Operation Enduring Freedom 2004-2005