Magnaflow Duramax Pro

TW_12_0099We’ve all heard that loud diesel exhaust that sounds impressive, at least to motorheads. There’s no doubt that this type of pipe is not overly restrictive to the system’s air flow, but your significant other and your neighbors may not appreciate such an exhaust system if they get to hear it every day.
Recently my uncle bought a pickup where the previous owner had shortened the exhaust to just past the cab. It sounded cool for a couple days but the novelty soon wore off. I installed a Magnaflow exhaust system on his Power-Stroke-powered Ford and ever since then it’s been a favorite of mine for the sound quality and dyno-proven performance.
Magnaflow builds their exhaust systems to be quiet enough at idle and cruise to let you enjoy conversations and music, but step on it and it comes to life with a healthy exhaust note that indicates that the entire system is breathing easier and freeing up power.
For improved breathing on a 2006 GMC Sierra Duramax, we choose Magnaflow’s Pro performance system, which features a satin finish, 100% stainless steel muffler with stainless steel band clamps with mandrel-bent stainless steel tubing. MagnaFlow says their mufflers are “100% stainless steel and lap-joint welded for solid construction and rugged reliability even in the most extreme conditions. They feature a free-flowing, straight-through perforated stainless steel core, stainless mesh wrap and acoustical fiber fill to deliver that smooth, deep tone.”
We opted not to add a polished stainless tip to this work truck, however Magnaflow has optional tips in a variety of styles to customize the look of your exhaust system.
Exhaust systems like the one featured here can free up some horsepower by themselves, however when used in conjunction with other modifications, such as improved intake flow and an engine programmer, it can really shine.

Applying a quality penetrating oil such as Prolong's SPL100 to the bolts and fasteners can help break them loose.
Applying a quality penetrating oil such as Prolong’s SPL100 to the bolts and fasteners can help break them loose.
Starting at the front of the pickup, we loosened and removed the v-band clamp, which connects the exhaust near the engine.
Starting at the front of the pickup, we loosened and removed the v-band clamp, which connects the exhaust near the engine.
Removing the clamps at the next connection back helped in the removal process.
Removing the clamps at the next connection back helped in the removal process.

 

 

 

 

 

 

 

 

 

Slide the clamp to one side to separate the front section from the axle back section of exhaust.
Slide the clamp to one side to separate the front section from the axle back section of exhaust.
A pry bar can be handy, with some lubrication, to remove the rubber hangers. Be sure to keep the hangers for re-use.
A pry bar can be handy, with some lubrication, to remove the rubber hangers. Be sure to keep the hangers for re-use.
The layout of the exhaust can make it a challenge to remove without dropping a portion of the lower subframe. This is when a reciprocating saw can come in handy to make more manageable chunks of the exhaust.
The layout of the exhaust can make it a challenge to remove without dropping a portion of the lower subframe. This is when a reciprocating saw can come in handy to make more manageable chunks of the exhaust.
The catalytic converter was easier to remove once we’d made our own cut in the exhaust.
The catalytic converter was easier to remove once we’d made our own cut in the exhaust.
James McCoy, head mechanic and owner of Garage 808, likes to remove and oil that may coat a new exhaust system so he uses some brake cleaner and a rag to remove it.
James McCoy, head mechanic and owner of Garage 808, likes to remove any oil that may coat a new exhaust system so he uses brake cleaner and a rag.
We started with the downpipe at the front of exhaust system. Re-using the stock v-band clamp, we installed the replacement piece from Magnaflow. You can work front to back assembling the pipes, but leave all connections loose until final fitment.
We started with the downpipe at the front of exhaust system. Re-using the stock v-band clamp, we installed the replacement piece from Magnaflow. You can work front to back assembling the pipes, but leave all connections loose until final fitment.
Re-use the rubber exhaust hangers as you piece together the system.  The exhaust system will hang in place until you tighten it and make final adjustments.
Re-use the rubber exhaust hangers as you piece together the system. The exhaust system will hang in place until you tighten it and make final adjustments.
The Magnaflow system uses slip joints with clamps to hold them in place and seal them from leaking. Sliding the clamps over the exhaust before installing can help speed up the operation.
The Magnaflow system uses slip joints with clamps to hold them in place and seal them from leaking. Sliding the clamps over the exhaust before installing can help speed up the operation.
The Magnaflow muffler gives the exhaust system a nice note while keeping it quiet during idle and cruising.
The Magnaflow muffler gives the exhaust system a nice note while keeping it quiet during idle and cruising.
Pay attention to the orientation of the pipes to make sure they clear suspension components like the shock seen here.  Note: If the suspension is unloaded on a lift, it may be in a different location with the truck on the ground.
Pay attention to the orientation of the pipes to make sure they clear suspension components like the shock seen here. Note: If the suspension is unloaded on a lift, it may be in a different location with the truck on the ground.
Make sure to torque the bigger clamps (not the hanger type) to the recommended 65 lbs/ft to ensure good seal and to hold the exhaust in place once you have good alignment.
Make sure to torque the bigger clamps (not the hanger type) to the recommended 65 lbs/ft to ensure good seal and to hold the exhaust in place once you have good alignment.
Double check that there is at least a half an inch of clearance between the exhaust other truck parts like the body, suspension and under carriage. You can rotate the pieces of the exhaust to fit gain the needed clearance. Re-torque the clamps after 25-50 miles of driving to make sure nothing has loosened.
Double check that there is at least a half an inch of clearance between the exhaust other truck parts like the body, suspension and under carriage. You can rotate the pieces of the exhaust to fit gain the needed clearance. Re-torque the clamps after 25-50 miles of driving to make sure nothing has loosened.
The Magnaflow downpipe back exhaust will let your engine breath better and free up power. Since we decided not to add a polished or chrome tip, the system is understated and won’t draw too much attention.
The Magnaflow downpipe back exhaust will let your engine breath better and free up power. Since we decided not to add a polished or chrome tip, the system is understated and won’t draw too much attention.

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