Magnaflow Turbo Downpipe — 2001-2007 GM Silverado/Sierra 6.6L Diesel

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SKU: MAG15399
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About Magnaflow MagnaFlow has been America's leader in stainless steel ...Read More

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Sale price$258.84 Regular price$289.44
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Magnaflow

MagnaFlow has been America's leader in stainless steel performance exhaust since 1981. From the rumbly Pro Street to the OE-quiet Touring series, every MagnaFlow exhaust delivers measurable HP, an unmistakable note, and a lifetime warranty.

Watch in action

Magnaflow 15399 Turbo Downpipe for GM 6.6L Diesel

Unleash the full potential of your 2001-2007 GM Silverado or Sierra with the Magnaflow 15399 Turbo Downpipe. Engineered to optimize exhaust flow directly from the turbocharger, this downpipe is crafted from durable, corrosion-resistant stainless steel and features precise mandrel bends for maximum efficiency. Experience improved throttle response, increased horsepower, and a more aggressive exhaust note.

Key Features:

  • Enhanced Flow: 4-inch diameter mandrel-bent stainless steel pipe maximizes exhaust gas velocity.
  • Durable Construction: 100% stainless steel ensures resistance to rust and extreme temperatures.
  • Performance Gains: Designed to improve turbo spool, reduce exhaust gas temperatures, and increase overall power output.
  • Precision Fitment: Engineered for a direct fit on 2001-2007 Chevrolet Silverado 2500 HD, 3500, and GMC Sierra 2500 HD, 3500 models with the 6.6L Duramax diesel engine.
  • Advanced Manufacturing: Produced using precision CNC robotic manufacturing techniques for consistent quality.

The Magnaflow 15399 Turbo Downpipe is an essential upgrade for diesel enthusiasts seeking to push the limits of their truck's performance. By reducing backpressure and improving exhaust scavenging, this downpipe allows your turbocharger to operate more efficiently, leading to noticeable gains in power and torque. Professional installation is recommended to ensure optimal performance and integration with your existing exhaust system.

Get your Magnaflow downpipe at GGCRACING today!

Vehicle Fitment

Years Make Model Trim
2001-2005 Chevrolet Silverado 2500 HD Base
2001-2006 Chevrolet Silverado 2500 HD LS
2001-2006 Chevrolet Silverado 2500 HD LT
2004-2006 Chevrolet Silverado 2500 HD WT
2007 Chevrolet Silverado 2500 HD Classic LS
2007 Chevrolet Silverado 2500 HD Classic WT
2001-2005 Chevrolet Silverado 3500 Base
2001-2006 Chevrolet Silverado 3500 LS
2001-2006 Chevrolet Silverado 3500 LT
2004 Chevrolet Silverado 3500 WT
2006 Chevrolet Silverado 3500 WT
2007 Chevrolet Silverado 3500 Classic LT
2007 Chevrolet Silverado 3500 Classic WT
2001-2002 GMC Sierra 2500 HD SL
2001-2006 GMC Sierra 2500 HD SLE
2001-2006 GMC Sierra 2500 HD SLT
2002-2005 GMC Sierra 2500 HD Base
2006 GMC Sierra 2500 HD SL
2007 GMC Sierra 2500 HD Classic SL
2007 GMC Sierra 2500 HD Classic SLE
2007 GMC Sierra 2500 HD Classic SLT
2007 GMC Sierra 2500 HD Classic WT
2001-2002 GMC Sierra 3500 SL
2001-2006 GMC Sierra 3500 SLT
2002-2005 GMC Sierra 3500 Base
2004-2006 GMC Sierra 3500 WT
2006 GMC Sierra 3500 SL
2007 GMC Sierra 3500 Classic SL
2007 GMC Sierra 3500 Classic SLE
2007 GMC Sierra 3500 Classic SLT
2007 GMC Sierra 3500 Classic WT

Product Details

Product Description
Part Numbers
Sizing & Fit

About Magnaflow

MagnaFlow has been America's leader in stainless steel performance exhaust since 1981. From the rumbly Pro Street to the OE-quiet Touring series, every MagnaFlow exhaust delivers measurable HP, an unmistakable note, and a lifetime warranty.

Watch in action

Magnaflow 15399 Turbo Downpipe for GM 6.6L Diesel

Unleash the full potential of your 2001-2007 GM Silverado or Sierra with the Magnaflow 15399 Turbo Downpipe. Engineered to optimize exhaust flow directly from the turbocharger, this downpipe is crafted from durable, corrosion-resistant stainless steel and features precise mandrel bends for maximum efficiency. Experience improved throttle response, increased horsepower, and a more aggressive exhaust note.

Key Features:

  • Enhanced Flow: 4-inch diameter mandrel-bent stainless steel pipe maximizes exhaust gas velocity.
  • Durable Construction: 100% stainless steel ensures resistance to rust and extreme temperatures.
  • Performance Gains: Designed to improve turbo spool, reduce exhaust gas temperatures, and increase overall power output.
  • Precision Fitment: Engineered for a direct fit on 2001-2007 Chevrolet Silverado 2500 HD, 3500, and GMC Sierra 2500 HD, 3500 models with the 6.6L Duramax diesel engine.
  • Advanced Manufacturing: Produced using precision CNC robotic manufacturing techniques for consistent quality.

The Magnaflow 15399 Turbo Downpipe is an essential upgrade for diesel enthusiasts seeking to push the limits of their truck's performance. By reducing backpressure and improving exhaust scavenging, this downpipe allows your turbocharger to operate more efficiently, leading to noticeable gains in power and torque. Professional installation is recommended to ensure optimal performance and integration with your existing exhaust system.

Get your Magnaflow downpipe at GGCRACING today!

Vehicle Fitment

Years Make Model Trim
2001-2005 Chevrolet Silverado 2500 HD Base
2001-2006 Chevrolet Silverado 2500 HD LS
2001-2006 Chevrolet Silverado 2500 HD LT
2004-2006 Chevrolet Silverado 2500 HD WT
2007 Chevrolet Silverado 2500 HD Classic LS
2007 Chevrolet Silverado 2500 HD Classic WT
2001-2005 Chevrolet Silverado 3500 Base
2001-2006 Chevrolet Silverado 3500 LS
2001-2006 Chevrolet Silverado 3500 LT
2004 Chevrolet Silverado 3500 WT
2006 Chevrolet Silverado 3500 WT
2007 Chevrolet Silverado 3500 Classic LT
2007 Chevrolet Silverado 3500 Classic WT
2001-2002 GMC Sierra 2500 HD SL
2001-2006 GMC Sierra 2500 HD SLE
2001-2006 GMC Sierra 2500 HD SLT
2002-2005 GMC Sierra 2500 HD Base
2006 GMC Sierra 2500 HD SL
2007 GMC Sierra 2500 HD Classic SL
2007 GMC Sierra 2500 HD Classic SLE
2007 GMC Sierra 2500 HD Classic SLT
2007 GMC Sierra 2500 HD Classic WT
2001-2002 GMC Sierra 3500 SL
2001-2006 GMC Sierra 3500 SLT
2002-2005 GMC Sierra 3500 Base
2004-2006 GMC Sierra 3500 WT
2006 GMC Sierra 3500 SL
2007 GMC Sierra 3500 Classic SL
2007 GMC Sierra 3500 Classic SLE
2007 GMC Sierra 3500 Classic SLT
2007 GMC Sierra 3500 Classic WT

Product Details

Product Description

About Magnaflow

MagnaFlow has been America's leader in stainless steel performance exhaust since 1981. From the rumbly Pro Street to the OE-quiet Touring series, every MagnaFlow exhaust delivers measurable HP, an unmistakable note, and a lifetime warranty.

Watch in action

Magnaflow 15399 Turbo Downpipe for GM 6.6L Diesel

Unleash the full potential of your 2001-2007 GM Silverado or Sierra with the Magnaflow 15399 Turbo Downpipe. Engineered to optimize exhaust flow directly from the turbocharger, this downpipe is crafted from durable, corrosion-resistant stainless steel and features precise mandrel bends for maximum efficiency. Experience improved throttle response, increased horsepower, and a more aggressive exhaust note.

Key Features:

  • Enhanced Flow: 4-inch diameter mandrel-bent stainless steel pipe maximizes exhaust gas velocity.
  • Durable Construction: 100% stainless steel ensures resistance to rust and extreme temperatures.
  • Performance Gains: Designed to improve turbo spool, reduce exhaust gas temperatures, and increase overall power output.
  • Precision Fitment: Engineered for a direct fit on 2001-2007 Chevrolet Silverado 2500 HD, 3500, and GMC Sierra 2500 HD, 3500 models with the 6.6L Duramax diesel engine.
  • Advanced Manufacturing: Produced using precision CNC robotic manufacturing techniques for consistent quality.

The Magnaflow 15399 Turbo Downpipe is an essential upgrade for diesel enthusiasts seeking to push the limits of their truck's performance. By reducing backpressure and improving exhaust scavenging, this downpipe allows your turbocharger to operate more efficiently, leading to noticeable gains in power and torque. Professional installation is recommended to ensure optimal performance and integration with your existing exhaust system.

Get your Magnaflow downpipe at GGCRACING today!

Vehicle Fitment

Years Make Model Trim
2001-2005 Chevrolet Silverado 2500 HD Base
2001-2006 Chevrolet Silverado 2500 HD LS
2001-2006 Chevrolet Silverado 2500 HD LT
2004-2006 Chevrolet Silverado 2500 HD WT
2007 Chevrolet Silverado 2500 HD Classic LS
2007 Chevrolet Silverado 2500 HD Classic WT
2001-2005 Chevrolet Silverado 3500 Base
2001-2006 Chevrolet Silverado 3500 LS
2001-2006 Chevrolet Silverado 3500 LT
2004 Chevrolet Silverado 3500 WT
2006 Chevrolet Silverado 3500 WT
2007 Chevrolet Silverado 3500 Classic LT
2007 Chevrolet Silverado 3500 Classic WT
2001-2002 GMC Sierra 2500 HD SL
2001-2006 GMC Sierra 2500 HD SLE
2001-2006 GMC Sierra 2500 HD SLT
2002-2005 GMC Sierra 2500 HD Base
2006 GMC Sierra 2500 HD SL
2007 GMC Sierra 2500 HD Classic SL
2007 GMC Sierra 2500 HD Classic SLE
2007 GMC Sierra 2500 HD Classic SLT
2007 GMC Sierra 2500 HD Classic WT
2001-2002 GMC Sierra 3500 SL
2001-2006 GMC Sierra 3500 SLT
2002-2005 GMC Sierra 3500 Base
2004-2006 GMC Sierra 3500 WT
2006 GMC Sierra 3500 SL
2007 GMC Sierra 3500 Classic SL
2007 GMC Sierra 3500 Classic SLE
2007 GMC Sierra 3500 Classic SLT
2007 GMC Sierra 3500 Classic WT

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