2001
and Newer Duramax T-304/T-409 Single and Dual Stainless Steel Systems
The MBRP exhaust systems, offered by Diesel Performance
Parts, Inc., for the General Motors Duramax diesel are manufactured
to replace the original equipment exhaust system components on any 2001
and newer Duramax diesel equipped pick up. The Duramax system is a complete
four-inch mandrel bent T-304 or T-409 stainless steel
system that includes the Spiral Flow core muffler and an optional five-inch
T-304 polished stainless steel, rolled edge tip (Dual
wall tips are standard on T-304 stainless steel systems). 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 by increasing the tubing size to four-inches and
by using the same style factory four bolt flange and using factory style
hardware to ensure an easy installation of the system. The intermediate
pipes have welded T-304 stainless steel hangers that guarantee
a correctly aligned installation. Crew cab long bed trucks will require
an optional short intermediate pipe that is used just prior to the spiral
flow muffler. (Required only on crew cab long bed body styles)
The Spiral Flow louvered muffler is a six-inch diameter by thirty-inch
long, mirrored polished stainless steel case, containing an inner packing
material made of stainless steel wool, with a ceramic blanket 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. That 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 stainless 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
four-inch tailpipe slides on the spiral flow core muffler and ends with
the optional five-inch tip (Dual wall tips are standard on T-304 systems).
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 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. (Dual wall tips are standard on all T-304 stainless
steel systems) 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 systems are available in both single four-inch systems and
also the Dual four-inch systems for the ultimate
in diesel exhaust systems. The Dual systems have both
a left and right side tail pipe exiting at a sweeping angle behind both
rear wheels. The T-304 Dual systems come standard with
dual wall tips for both left and right side tail pipes, while the T-409
systems can add tips as an option.
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 T-304 stainless steel systems are protected by an
exclusive Limited Lifetime Warranty policy, to the original purchaser.
The T-409 stainless steel systems are protected by a five
year warranty to the original purchaser.
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