



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:
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Diameter: 4.00"
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Construction: 1-piece
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Material: 409 Stainless Steel
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Bend: Mandrel bent for optimal exhaust flow
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Fitment: 2nd Gen Dodge Cummins (1994–2002) with stock-angle (40°) manifold
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⚙️ Key Notes:
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DIY Fabrication Kit – Flange must be jigged and welded onto the pipe
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Choose your flange style and manifold orientation (up or down)
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When using a manifold in the UP position: a 1" spacer is required (included in full Stainless Diesel kits)
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Due to variability in aftermarket exhaust systems, final connection may require trimming or modification
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💥 Optional Add-Ons:
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Turbo Flange (select your style)
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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
Pairs well with
Ships within 1-2 business days.
Free shipping & returns

4.00" Make Your Own Down Pipe - Stainless
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FAQs
Please read our FAQs page to find out more.
Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
Do OEM parts come with a warranty?
Yes, many OEM auto parts come with a manufacturer’s warranty that covers defects or issues. Be sure to check the warranty details for each part at the time of purchase, and keep your receipt for any potential warranty claims.