03-07 Chev./GMC Silverado/Sierra 4.8L/5.3L “COOL DUALS”™ Removal of stock system: 1. Apply a penetrating lubricant liberally to all exhaust fasteners, hangers and rubber insulators. 2. Remove the nuts from the studs holding the front flange together and disconnect exhaust system. 3. Remove the hangers from the rubber insulators and remove the exhaust from the vehicle. If a hoist or hydraulic lift is not being used the tail pipe may need to be cut to clear the rear axle. 4.