Stainless Steel Diesel Muffler
Type: Diesel Performance Exhaust Muffler
Bring your truck to life with the Diesel Performance Exhaust Muffler, engineered to deliver both sound and performance. Available in T409 unpolished stainless steel 4-inch and 5-inch models, these mufflers reduce back pressure, enhance airflow, and create a bold, throaty exhaust tone.
Perfect for both classic diesel builds and modern trucks, these mufflers install seamlessly with Black Bandit Exhaust Systems, which include pre-bent and pre-welded hangers.
Vehicle Compatibility
✅ Cummins
✅ Duramax
✅ Powerstroke
❌ Not compatible 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 – maximizes performance by reducing back pressure
- Non-directional design – install in either direction for flexibility
- T409 stainless steel – durable and corrosion-resistant
- Fiberglass & mesh interior – absorbs resonance for a richer, deeper exhaust note
- Pair with Black Bandit systems – for seamless integration and easy installation
Why Choose Black Bandit Mufflers?
- Designed as performance upgrades, not just replacement parts
- Provides a throaty, bold exhaust tone with improved airflow
- Straight-through design enhances efficiency and horsepower
- Can be paired with T304 exhaust tips for a complete visual and sound transformation
Installation & Fitment Notes
- Mufflers do not include hardware; you may need to weld or provide clamps depending on your exhaust system
- Ensure correct sizing (4" or 5") for compatibility with your setup
- Best paired with systems that include a “muffler-delete pipe” for direct replacement
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.
