MagnaFlow GMC DIESEL DURAMAX, DUAL SYSTEM Aluminized Pro Series Diesel PERFORMANCE EXHAUST - Manual

Step 1: (Carefully read all instructions before
installation) To remove the OEM system, you
will need to cut the tailpipe just behind the OEM
muffler. You can then unbolt the muffler at the
3-bolt flange, and disengage the welded tailpipe
hangers from the rubber insulators. Do not
damage or discard the OEM gasket, fasteners, or
rubber insulators, as they will be reused to
mount the new system.
Step 2: Install the new inlet pipe using the OEM
gasket and fasteners, but leave all clamps and
fasteners loose for final adjustment of the
complete system. Install the new muffler and
Y-pipe assembly using the supplied 4.00"
clamps and by fitting the welded hangers into
the rubber insulators. Install the tailpipe
extensions and tailpipe assembly in a similar
fashion using the supplied 3.50" clamps. The
driver-side extension pipe has 3 bends, and is
longer than the passenger-side.
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 if
necessary.
Mufflers, Converters,
Systems and Tips
INSTALLATION INSTRUCTIONS
18915
2008 GM Duramax 6.6L 4" Duals
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.
** Magnaflow Performance Exhaust recommends professional
installation on all their products
Magnaflow Performance Exhaust - 22961 Arroyo Vista Rancho Santa Margarita, CA 92688
Main #: 1-800-990-0905 Technical Support: 1-800-959-9226 ext 4500 Nov 30, 2012
Rev: 000
Inlet Pipe
19.25" Extn. Pipe
[2] 4.00" Clamps
Y-Pipe Assy.
D/S Tail Pipe Extn.
P/S Tail Pipe Extn.
Tail Pipe Assy.
[4] 3.50" Clamps