How to Install Magnaflow Off Road Pro Series Cat-Back Exhaust - Turn Down on your F-150

2004-2008 Ford F-150 S/C 4.6/5.4L

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) Unbolt the clamp attaching the OEM
muffler inlet to the catalytic converter extension. The
OEM system can now be removed by disengaging
the welded hangers from the OEM rubber isolators
(Do not damage the OEM rubber isolators, as they
will be reused to mount the new system.) You may
need to cut the tailpipe about 1" behind the muffler to
aid in removal.

Step 2: Fasten the Inlet Pipe to the catalytic
converter extension using the OEM clamp assembly.
Leave all clamps and fasteners loose for final
adjustment of the complete system. Install the
Extension Pipe, Muffler Sub Assembly, and Tip in the
same fashion using the supplied clamps.

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 65ft-lbs). U-bolt clamps should be
tightened to approximately 30-35ft-lbs. Inspect all
fasteners after 25-50 miles of operation and retighten
if necessary.