4.00" Make Your Own Down Pipe

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

Build your own high-flow exhaust solution with this DIY 2nd Gen Dodge Style Downpipe Kit — designed specifically for 1994–2002 Cummins trucks using a stock-angle (40°) 2nd Gen T4 exhaust manifold. Whether your manifold is flipped up or down, this kit gives you the flexibility to configure your single turbo setup exactly how you want it.

Featuring mandrel-bent 4.00" mild steel and customizable flange/clamp options, this downpipe is ideal for fabricators and performance builders who want clean welds, maximum flow, and reliable fitment — all starting from a proven foundation.

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🧰 What’s Included:

• 4.00" Mandrel-Bent Downpipe (1-Piece Mild Steel)

• Your Choice of Turbo Flange (select above)

• Optional V-Band Clamp (add-on if selected)

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⚙️ Key Features:

• Built for 1994–2002 5.9L Cummins trucks using stock 40° T4 2nd Gen-style manifolds

• Works with manifold in up or down position (spacer required for up-facing setups)

• DIY Kit: You will need to jig and weld the flange onto the pipe

• Not guaranteed to directly match existing aftermarket exhaust — some modification may be required

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🛠 Notes:

• This is a raw, weld-it-yourself kit — ideal for custom single turbo setups

• If manifold is facing up, a 1.00" spacer (included in our full 2G kits) is required for proper alignment

• Clamp not included unless specified at checkout

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💥 Why Choose This Kit?

• Customize your own turbo downpipe layout for your specific build

• High-flow mandrel bends for reduced backpressure and better spool

• Perfect for custom builders, fabricators, and shop installs

• Built from the same components used in Stainless Diesel’s race-proven kits