Stainless Steel Diesel Muffler
Type: Exhaust Systems
Enhance your truck’s sound and exhaust flow with our T409 unpolished stainless steel mufflers, designed for a wide range of diesel vehicles including Cummins, Duramax, and Powerstroke platforms. Available in both 4-inch and 5-inch sizes, these mufflers are engineered for durability, airflow, and a bold exhaust note.
Perfect for classic builds or modern trucks, they pair seamlessly with Black Bandit exhaust systems for straightforward installation.
Vehicle Compatibility
✅ Cummins
✅ Duramax
✅ Powerstroke
❌ Not for use with gasoline vehicles
Specifications
| Feature | 4-Inch Muffler | 5-Inch Muffler |
|---|---|---|
| Material | T409 Unpolished Stainless Steel | T409 Unpolished Stainless Steel |
| Inlet Size | 4" inner diameter | 5" inner diameter |
| Outlet Size | 4" inner diameter | 5" inner diameter |
| Overall Length | 20.25 inches | 20.25 inches |
| Body Length | 14 inches | 14 inches |
| Body Size | 7-inch round | 8-inch round |
Key Features
- Straight-through flow path – reduces back pressure for improved performance
- Non-directional design – install in either direction for flexibility
- Stainless steel build – T409 construction for long-lasting durability
- Fiberglass & mesh interior – absorbs resonance for a deeper, richer exhaust tone
- Compatible with Black Bandit exhaust systems – designed for easy pairing
Benefits
- Louder, deeper exhaust note without interior drone
- Improved airflow and reduced restriction
- Long-term resistance to harsh conditions
- Flexible installation options to suit your build
Sizing & Selection
- Choose 4-inch for trucks running standard 4" exhaust setups
- Choose 5-inch for trucks running upgraded 5" exhaust systems
- Always confirm inlet/outlet diameter before purchase for the best fit
Important Notes:
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Return Policies
Your satisfaction is important to us. If you wish to return an item or request a refund, please review the terms and conditions outlined in our Returns Policy.
Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
