# MagnaFlow 15399 4" Diesel Extension Pipe for 2001-2004 Chevrolet Silverado 2500 Hd and More ### Performance Overview The Magnaflow Diesel Extension Pipe is crafted from 100% premium grade stainless steel for absolute durability even in the harshest of conditions. These pipes feature mandrel bent tubing for maximum performance gains in horsepower, torque, and throttle response. Just like the enthusiasts they serve, Magnaflow is driven by quality and performance so you can rest assured that you're getting a product worth buying with Magnaflow. ### Key Features - Brand: MagnaFlow - Part number: 15399 - Product type: 4" Diesel Extension Pipe - Designed for compatible vehicle applications listed on this page ### Vehicle Fitment - 2001 Chevrolet Silverado 2500 Hd, Note: Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2002 Chevrolet Silverado 2500 Hd, Note: Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2003 Chevrolet Silverado 2500 Hd, Note: Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2004 Chevrolet Silverado 2500 Hd, Note: Base, Ls, Lt, Wt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2001 Chevrolet Silverado 3500, Note: Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2002 Chevrolet Silverado 3500, Note: Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2003 Chevrolet Silverado 3500, Note: Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed - 2004 Chevrolet Silverado 3500, Note: Base, Ls, Lt, Wt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed ### FAQ **Will this fit my vehicle?** Please verify your year, make, model, position, and any fitment notes using the compatibility list above before purchase. **What part number is this?** The listed part number is 15399. **Is this product designed for direct replacement?** Yes. This product is intended to match compatible vehicle applications listed in the fitment section. **Should I confirm fitment before ordering?** Yes. Always compare your original part, position, and vehicle details with the fitment chart before ordering. ### Common Searches - 4" Diesel Extension Pipe for Chevrolet Silverado 2500 Hd - 15399 fitment - MagnaFlow 4" Diesel Extension Pipe - 2001 Chevrolet Silverado 2500 Hd 4" Diesel Extension Pipe ### Vehicle Fitment Table Year Make Model Position Fitment Precision Note 2001 Chevrolet Silverado 2500 Hd Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2002 Chevrolet Silverado 2500 Hd Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2003 Chevrolet Silverado 2500 Hd Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2004 Chevrolet Silverado 2500 Hd Base, Ls, Lt, Wt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2001 Chevrolet Silverado 3500 Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2002 Chevrolet Silverado 3500 Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2003 Chevrolet Silverado 3500 Base, Ls, Lt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2004 Chevrolet Silverado 3500 Base, Ls, Lt, Wt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2001 GMC Sierra 2500 Hd Sl, Sle, Slt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2002 GMC Sierra 2500 Hd Base, Sl, Sle, Slt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2003 GMC Sierra 2500 Hd Base, Sle, Slt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2004 GMC Sierra 2500 Hd Base, Sle, Slt, Wt; 6.6L; Extended Cab W/96.0 In./8 Ft. Bed 2001 GMC Sierra 3500 Sl, Sle, Slt; 6.6L; Crew Cab W/96.0 In./8 Ft. Bed, Extended Cab W/96.0 In./8 Ft. Bed 2002 GMC Sierra 3500 Base, Sl, Sle, Slt; 6.6L; Crew Cab W/96.0 In./8 Ft. Bed, Extended Cab W/96.0 In./8 Ft. Bed 2003 GMC Sierra 3500 Base, Sle, Slt; 6.6L; Crew Cab W/96.0 In./8 Ft. Bed, Extended Cab W/96.0 In./8 Ft. Bed 2004 GMC Sierra 3500 Base, Sle, Slt, Wt; 6.6L; Crew Cab W/96.0 In./8 Ft. Bed, Extended Cab W/96.0 In./8 Ft. Bed ## Details - **Price:** 461.65 CAD - **Vendor:** MagnaFlow - **Type:** 4" Diesel Extension Pipe - **Tags:** 15399, 2001 Chevrolet Silverado 2500 Hd, 2001 Chevrolet Silverado 3500, 2001 GMC Sierra 2500 Hd, 2001 GMC Sierra 3500, 2002 Chevrolet Silverado 2500 Hd, 2002 Chevrolet Silverado 3500, 2002 GMC Sierra 2500 Hd, 2002 GMC Sierra 3500, 2003 Chevrolet Silverado 2500 Hd, 2003 Chevrolet Silverado 3500, 2003 GMC Sierra 2500 Hd, 2003 GMC Sierra 3500, 2004 Chevrolet Silverado 2500 Hd, 2004 Chevrolet Silverado 3500, 2004 GMC Sierra 2500 Hd, 2004 GMC Sierra 3500, 4" Diesel Extension Pipe, Auto Parts, Automotive, Catalytic Converter, Direct Replacement, Exhaust Performance, Exhaust System, MagnaFlow, Magnaflow-15399, Muffler, Performance Exhaust, Performance Parts, Vehicle Fitment ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 461.65 CAD | In stock | ## Images - MagnaFlow 15399 4" Diesel Extension Pipe --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/magnaflow-chevrolet-silverado-2500-hd-exhaust-pipe-15399) > Updated: 2026-07-16