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USD 456.47
Part #: MAG17880

Magnaflow 17880 4" Downpipe-Back Stainless Custom Builder Pipe Kit

2001-2004 GM 6.6L Duramax (Crew & Ext. Cabs)
Part #: MAG17880
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The Magnaflow 17880 4" Downpipe-Back Stainless Custom Builder Pipe Kit offers the most options when building an exhaust for your 2001-2004 GM 6.6L Duramax. For the racer, it provides a mandrel bent pipe-only exhaust from downpipe to tail pipe complete with all hardware. For the street driver, the CBPK is the basis for a custom exhaust that allows you to purchase and install the converter, muffler and tip of your choice. The Stainless Steel Custom Builder Pipe Kit Series has a lifetime warranty.

Features & Specifications:
  • Material: 4" Stainless Steel 
  • Mandrel Bent Construction 
  • System Type: Downpipe-Back  
  • Tip Quantity: No Tip Included 
  • Exit Position: Single Passenger Side Exit 
  • Lifetime Warranty 
Fitment Note: All Crew & Extended Cabs applies to GM 2500HD/3500HD Pickups. This system is not designed for use on Cab & Chassis models.


  • MFG. Number 17880
  • Manufacturer Name MagnaFlow
  • Shipping Weight 64.00 lb.
  • Shipping Length 57.13 in.
  • Shipping Width 12.38 in.
  • Shipping Height 15.5 in.
  • Fuel Type Diesel
  • Diameter 4"
  • Exhaust Exit Single
  • Exhaust Type Downpipe-Back
  • Material T409 Stainless Steel
  • UPC 888563084343
  • Warranty Yes
  • Warranty Info Lifetime
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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XDP continues to closely monitor the COVID-19 (Coronavirus) outbreak. As an integral part of the automotive supply chain, at this point all call centers and distribution centers remain fully operational to ensure we keep vital service components flowing to vehicles used in transport of goods and emergency response. To ensure the health of our employees, families, and customers, we have made the following procedural changes:

  • UPDATE: Effective 6/1 Customer Service resumes normal business hours of M-F 8:30 – 9:00pm EST.
  • Effective 3/18 we have decided to temporarily close both of our retail stores in NJ and NV.
  • Our technical sales team remains available Mon-Fri 8:30am-9pm and Saturday 10:30am-7pm EST.
  • All employees have been encouraged to follow the CDC's recommendations at home and in the workplace.
The circumstances of this virus are fast moving, as such, we will continue to update you with any further operational adjustments as needed. As always, we value your business and appreciate your patience as we manage this situation together.
Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.