Correct, no factory cabin air filter. If you have one it's under the passenger windshield wiper. With the hood up you can get to it. If none, you can buy a kit for about $50 and filters are about $30.
2006 GC Limited, 5.7L HEMI, Quad II. 4XGUARD Belly & Front (black powder coat) skid plates. Matrix front guard, PIAA Matrix mounted lights, 265/70 Nitto Trail Graplers MT, 1.5" Spider Trax spacers, Super Chips Tuner, OME MD Lift, 4XGUARD differential guard, JBA UCA'S.