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 The
MBRP exhaust systems, offered by Diesel Performance
Parts, Inc., for the General Motors Duramax system are manufactured
to replace the original equipment exhaust system components on any 2001
and newer Duramax equipped pick up. The Duramax system is a complete four-inch
mandrel bent aluminized steel system that includes the Spiral Flow core
muffler and any of four optional five inch T-304 polished
stainless steel tips. The system has been designed to accommodate any of
the various cab and bed length pick up bed designs currently produced by
General Motors.
The
Duramax system begins with increasing the tubing size to four-inches by
using the same style of factory four bolt flange and using the factory
style hardware to ensure an easy installation of the system. Crew Cab long
bed body style trucks will require an optional short intermediate pipe
used that is installed just prior to the spiral flow muffler. (Required
only on crew cab)
The
Spiral Flow louvered muffler is a six-inch diameter by thirty-inch long,
aluminized steel case, containing an inner packing material made of stainless
steel wool, with a ceramic wool outer packing. The competitions diesel
muffler in a lot of cases is a hollow core/can without any packing material
that actually produces a restriction by allowing the hot exhaust gasses
to get into the outer “can” and then trying to “fight”
their way back out of the outer can into the main exhaust stream. This
is the exact opposite of the reason you are looking for a performance exhaust
systems in the first place. The interior of the muffler is a four-inch
aluminized steel tube that dampens the resonance of diesel exhaust and
still keeps the interior noise level of the cab within comfortable levels
of the factory sound level. The muffler incorporates a Spiral Flow louver
that is specifically designed for diesel exhaust performance. Notice too
the size of the louvers is small to eliminate any restriction, but large
enough to dampen exhaust noise. Some competitive louvered mufflers use
extremely large louvers that are a major restriction in exhaust flow. The
spiral pattern (view
picture)
of the louvers promotes the same flow the turbocharger introduced to the
exhaust gasses as they left the turbocharger. The spiral pattern of the
louvers helps speed the exhaust gasses out of the exhaust system to lower
the exhaust gas temperatures as quickly as possible. The muffler uses innovative
designs like the reversed washer muffler end plates. Most exhaust manufacturers
weld the muffler end caps or washers to the outside of the muffler’s
inner tubing in an exposed area. That is OK if you are using only stainless
steel! However on aluminized systems that weld will be exposed to the first
rain or salt spray you encounter. We take our end cap and stamp it with
an internal flange to protect the muffler and provide the longest possible
lifespan. Another benefit of the reversed end cap is a smooth attractive
muffler appearance.
 The
four-inch tailpipe slides on the spiral flow core muffler and ends with
any of the four available optional five-inch T-304 stainless tips. The
systems we offer do NOT have a TWO piece
tail pipe design. Not only is a two piece design more prone to corrosion
and moving out of alignment as the system ages, it has an unattractive
clamp joint that is readily visible on all four wheel drive applications.
A tail pipe made out of a single piece of stainless steel is exactly how
the OEM manufacturer designed your factory system and it is the best most
secure and attractive way to build a performance system as well. Diesel
Performance Parts, Inc. offers optional tips that are available
in five-inch T-304 polished stainless steel as either
a straight cut or angle cut single wall rolled edge, or as a dual wall
straight cut or angle cut edge designs. The tip is located directly behind
the rear wheel and is battered by road debris. The road debris will cause
rust almost immediately in a chrome-plated tip, but not in a T-304
stainless tip. The joint clamps provided in our systems are plated to prevent
corrosion and provide a long life. You can’t use a stainless steel
joint clamp as the threads of the stainless fasteners will “gall
up” when tightened sufficiently to seal the stainless steel joints.
The Duramax exhaust system has been dyno tested to produce as much as 25-horsepower
and 39-foot pounds of torque. While at the same time lowering your exhaust
gas temperatures up to as much as 200 degrees, and spooling up your turbocharger
dramatically quicker. The horsepower and torque gains are extremely important
but the ability of an exhaust system to lower your exhaust gas temperatures
so you can add other performance improvements is of prime consideration
for your engine. There are also some mileage gains to be realized, based
on your driving style and location.
The aluminized steel systems are protected by a one year warranty policy,
to the original purchaser.
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