Dodge
Cummins T-304 and T-409 Stainless Steel Four Inch Single and Dual Exhaust
Systems
 The
MBRP XP and PRO exhaust systems offered by Diesel
Performance Parts, Inc. for the Dodge Cummins 5.9 diesel is designed
to replace the entire factory exhaust system for 1994 and newer model years.
The system is manufactured of mandrel bent T-304 or T-409
stainless steel tubing and welded hanger components. T-304
mandrel bent stainless steel is the industries premium material for exhaust
system use, the best of the best! Every system is packaged to fit any style
pick up cab or bed length. This is accomplished without any cutting, as
the tubing is precisely designed for each body and bed style.
The Dodge Cummins system begins with a four-inch T-304
or T-409 stainless steel down pipe, followed by the four-inch
intermediate pipe. The Spiral Flow muffler is manufactured from polished
stainless steel followed by the four-inch mandrel bent tail pipe that can
include an optional five-inch T-304 mirror polished stainless
steel rolled edge tip. (Dual wall tips are standard on T-304 stainless
systems).
 The spiral
flow louver muffler is a six-inch round by thirty-inch long stainless steel
case, containing an inner packing material made of stainless steel wool,
with a ceramic blanket outer packing material. The interior of the muffler
is a one piece 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 original factory sound level. 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 enter the outer “can” and then when trying to “fight”
their way back out of the outer can into the main exhaust stream create
a restriction. That is contradictory to the reason you are looking for
a performance exhaust systems in the first place. The MBRP
muffler design uses a spiral flow louver that is specifically designed
for diesel exhaust performance. The spiral pattern (view
picture)
of the louvers promotes the same twist the turbocharger introduced to the
exhaust gasses as they left the turbocharger housing. The spiral flow of
the louvers helps speed the exhaust gasses out of the exhaust system to
lower the exhaust gas temperatures as quickly as possible. 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.
Every stainelss system uses 100% welded on T-304 stainless
steel hangers that coincide with the factory hanger location to make installation
extremely easy. This is also the most secure and permanent method of mounting,
exactly like the original equipment system was designed. Hangers are generally
made of mild steel and will rust and fail over a short period of time,
then the system will loosen up and misalign itself. The 100% welded T-304
stainless steel hangers eliminate this problem. The joint clamps provided
in our systems are plated to prevent corrosion and provide a long life.
Stainless steel joint clamps can not be used as the threads of the fasteners
will “gall up” when tightened sufficiently to seal the joints.
Stainless steel tubing is extremely hard and the joints will need to be
clamped to a much higher torque value than in a mild steel system.
The tail pipe is a four-inch T-304 or T-409
stainless steel mandrel bent tube that provides the maximum clearance for
the suspension and spare tire during installation. 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 (standard on T-304 stainless
systems) in five-inch T-304 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 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 Dual
T-304 systems come standard with dual wall T-304 tips for both the left
and right side tail pipes. Tips are optional for the T-409 systems.
The Dodge Cummins exhaust system has been dyno tested to provide as much
as 24-horsepower and 53-foot pounds of torque. The average gain is 19-horsepower
and 43-foot pounds of torque. The exhaust system will lower your exhaust
gases by up to as much as 200 degrees, while providing a quicker spool
up time on your turbocharger. There are even fuel mileage gains with our
exhaust system. The mileage gains will vary by individual driving style
and location. Extra power is great, but lower exhaust gas temperatures
will allow you to make other performance modifications to your diesel engine
and still keep the exhaust gas temperatures still at a safe level.
The
T-304 stainless steel systems are protected by an exclusive
Limited Lifetime Warranty, to the original purchaser. The T-409
stainless steel systems are protected by a 5 year warranty to the original
purchaser.
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