Description
4-Inch Diesel Muffler Resonator — 4" Inlet/Outlet — 20" Overall — Stainless Steel
⚠️ OFF-ROAD USE ONLY
The 4-Inch Diesel Muffler Resonator is a heavy-duty stainless steel muffler designed for diesel truck custom exhaust builds and performance applications. With a 4-inch inlet, 4-inch outlet, and 20-inch overall body length, this straight-through perforated core design optimizes exhaust flow while reducing drone and rasp. Ideal for custom exhaust fabrication, DPF/CAT delete pipe replacement, and competition/off-road diesel builds.
Key Features
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4-Inch Diameter Throughout: True 4-inch inlet and outlet — no restrictions, no adapters needed. Ideal for 4-inch diesel exhaust systems on Ford Powerstroke, Ram Cummins, and GM Duramax platforms.
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Straight-Through Perforated Core: Maximizes exhaust flow with minimal backpressure while the perforated tube and packing material effectively reduce high-frequency rasp and drone.
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304 Stainless Steel Construction: Full stainless body and internals — won't rust out like aluminized steel mufflers after one winter in the salt belt.
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TIG-Welded End Caps: Precision TIG-welded caps for gas-tight seals and a clean, professional appearance.
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20-Inch Overall Length: Compact enough to fit most truck exhaust configurations while providing meaningful sound attenuation. Body length: approximately 14 inches.
Specifications
| Spec |
Value |
| Inlet Diameter |
4 inches (101.6mm OD) |
| Outlet Diameter |
4 inches (101.6mm OD) |
| Overall Length |
20 inches (508mm) |
| Body Length |
Approx. 14 inches (356mm) |
| Core Design |
Straight-through perforated |
| Material |
304 Stainless Steel |
| Intended Use |
Off-Road / Competition Only |
Frequently Asked Questions
Q: Is this muffler street legal?
A: For off-road and competition use only. This muffler is not EPA/CARB certified for on-road use when used as a replacement for factory emissions components. Check your local and state regulations before installation.
Q: How much will this quiet down my straight-piped diesel?
A: A straight-through resonator like this typically reduces overall volume by 3-5 dB and significantly cuts high-frequency rasp and drone at highway speeds (65-75 mph). It will NOT make your truck quiet — that requires a chambered or baffled muffler.
Q: What vehicles does this fit?
A: Any diesel truck with a 4-inch exhaust system — Ford 6.0L/6.4L/6.7L Powerstroke, Ram 5.9L/6.7L Cummins, GM 6.6L Duramax, and custom turbo-diesel builds. The universal 4-inch slip-fit design requires welding or band clamps for installation.
Q: Do I need welding to install this?
A: Yes, or use 4-inch stainless steel band clamps (sold separately). Professional exhaust shop installation is recommended for proper alignment and leak-free fitment.
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