How to Install Magnaflow MF Series Black Cat-Back Exhaust - Single Side Exit on your Sierra

Warning: When working on, under, or around any vehicle exercise caution. Please allow the vehicle's exhaust system to cool before removal, as exhaust system temperatures may cause severe burns. If working without a lift, always consult vehicle manual for correct lifting specifications. Always wear safety glasses and ensure a safe work area. Serious injury or death could occur if safety measures are not followed.

Step 1: (Carefully read all instructions before installation) To remove the OEM exhaust system, you will first need to cut the pipe behind the muffler before it goes over the axle. You can then disengage the welded hangers from the rubber insulators and remove the tailpipe. Unbolt the muffler inlet from the catalytic converter at the clamp junction. Do not damage or discard the OEM fasteners or rubber insulators, as they will be reused to mount the new system. Disengage the muffler hangers and remove it from the vehicle.

Step 2: Install the new Inlet Pipe Assy at the ball flare using the OEM fastener. Leave all clamps and fasteners loose for final adjustment of the complete system. For the crew cab short bed ONLY install the 12.5" extension pipe. Next install the muffler and tailpipe in a similar fashion using the supplied 3" clamps and by fitting the welded hangers into the OEM rubber insulators. For the Extended Cab Short Bed the hanger on the front pipe of the muffler Assembly will not be used.

Step 3: With all components mounted loosely, adjust the system for overall aesthetics and clearance of frame & bodywork. (MAGNAFLOW recommends at least 1/2" of clearance between the exhaust system and any body panels to prevent heat-related body damage or fire.)

Step 4: Once a final position has been chosen for the new system, evenly tighten all fasteners from front to rear. The supplied band clamps must be VERY tight to properly align the pipes and prevent leaks (Approximately 40ft-lbs). U-bolt clamps should be tightened to approximately 30-35ft-lbs. Inspect all fasteners after 25-50 miles of operation and retighten.