4.00" Make Your Own Down Pipe - Stainless

🔥 2nd Gen Dodge 4.00" DIY Downpipe Kit – 409 Stainless Steel (1994–2002 Cummins)

Build your custom single turbo exhaust setup the right way with this 2nd Gen Dodge-style DIY downpipe kit. Designed specifically for 1994–2002 5.9L Cummins trucks running a stock-angle (40°) 2nd Gen manifold, this high-flow, mandrel-bent 4.00" pipe is crafted from 409 stainless steel for strength, durability, and heat resistance.

This is a weld-it-yourself pipe designed for builders and fabricators who want a clean, high-performance fit with customizable turbo flange and manifold orientation options.

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🧰 Specifications:

• Diameter: 4.00"

• Construction: 1-piece

• Material: 409 Stainless Steel

• Bend: Mandrel bent for optimal exhaust flow

• Fitment: 2nd Gen Dodge Cummins (1994–2002) with stock-angle (40°) manifold

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⚙️ Key Notes:

• DIY Fabrication Kit – Flange must be jigged and welded onto the pipe

• Choose your flange style and manifold orientation (up or down)

• When using a manifold in the UP position: a 1" spacer is required (included in full Stainless Diesel kits)

• Due to variability in aftermarket exhaust systems, final connection may require trimming or modification

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💥 Optional Add-Ons:

• Turbo Flange (select your style)

• V-Band Clamp (optional – not included unless selected)

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Why Fabricators Choose This Kit:

✅ High-quality 409 stainless withstands heat, corrosion, and vibration
✅ Smooth, mandrel bends ensure free-flowing exhaust
✅ Flexible setup allows for true custom installation
✅ Same base pipe used in Stainless Diesel turbo kits