Will this muffler help with my fuel economy?

Yes. By reducing backpressure and helping the engine breathe more freely, many users report improved engine efficiency and lower exhaust gas temperatures (EGTs).

Is there excessive "drone" inside the cab?

Our internal stainless steel mesh is specifically engineered to cancel out unwanted interior resonance, providing a deep sound outside while keeping the cabin quiet for long-distance driving.

4" & 5" Stainless Steel Diesel Muffler for Ram Cummins, Duramax & Powerstroke DieselPerf

4" & 5" Stainless Steel Diesel Muffler for Ram Cummins, Duramax & Powerstroke

Q: Does it matter which end is the inlet?

No. This is a non-directional design, meaning it provides the same high-flow performance regardless of which direction it is installed in your exhaust system.

$124.00

PATRIOT DAY SALE: 13% OFF

In stock

Ships from USA in 1-2 Business Days

Size

4'' 5''

Shipping Policy at Dieselperf, Learn More

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Please note: All sales of exhaust pipes, straight pipes, and engine pipes are final and Non-Returnable and Non-Refundable

Upgrade your diesel truck’s exhaust system with a high-performance T409 stainless steel diesel muffler designed for strong airflow, durable performance, and a deep, refined exhaust tone. Available in both 4-inch and 5-inch inlet/outlet sizes, this muffler is a practical choice for many Ram Cummins, Ford Powerstroke, and Chevy/GMC Duramax diesel exhaust systems.

Built with a straight-through performance core, this muffler helps reduce exhaust restriction and supports smoother exhaust flow compared with many factory-style baffled mufflers. Whether your truck is used for towing, hauling, daily driving, or performance upgrades, it delivers a strong diesel sound without the harsh rasp often associated with muffler-delete setups.

The heavy-duty T409 stainless steel body is made to handle high exhaust temperatures, road conditions, and long-term use. Inside, stainless steel mesh and heat-resistant fiberglass packing help absorb unwanted resonance while maintaining a deep, aggressive tone outside the vehicle.

Key Features

Available in 4" and 5" Sizes
Choose the correct inlet and outlet diameter for your diesel exhaust setup.

T409 Stainless Steel Construction
Durable stainless steel material helps resist corrosion and withstand demanding diesel truck conditions.

Straight-Through Performance Core
Designed to improve exhaust flow and reduce unnecessary backpressure.

Deep Diesel Exhaust Tone
Internal stainless steel mesh and fiberglass packing help control rasp and cabin drone while keeping a rich, powerful sound.

Universal Non-Directional Design
Can be installed in either direction, making it suitable for many custom or replacement exhaust systems.

Built for Diesel Applications
Compatible with many 4-inch and 5-inch diesel exhaust systems used on Cummins, Duramax, and Powerstroke trucks.

Specifications

Attribute	Details
Material	T409 Heavy-Duty Stainless Steel
Size Options	4.0-Inch or 5.0-Inch Inlet/Outlet
Internal Design	Straight-Through Performance Core
Packing Material	Stainless Steel Mesh and Heat-Resistant Fiberglass
Flow Direction	Non-Directional / Bi-Directional
Fitment Type	Universal Fit for Matching Exhaust Pipe Diameter

Vehicle Fitment

This diesel muffler is designed for trucks equipped with matching 4-inch or 5-inch exhaust piping, including many:

Ram Cummins 2500/3500 models
Ford Powerstroke F-250/F-350 models
Chevy/GMC Duramax 2500/3500 models

Please measure your existing exhaust pipe diameter before ordering to confirm whether you need the 4-inch or 5-inch version.

Why Choose This Diesel Muffler?

Factory-style mufflers can restrict airflow and soften the diesel sound many truck owners want. This stainless steel diesel muffler combines a high-flow straight-through design with internal sound-control materials, giving you the performance feel of a freer-flowing exhaust system with a cleaner, more controlled tone.

It is a strong upgrade for drivers who want better exhaust flow, durable stainless steel construction, and a deep diesel sound without excessive interior noise.

Frequently Asked Questions

Does it matter which end is the inlet?
No. This muffler uses a non-directional design, so it can be installed in either direction.

Will this fit my truck?
This is a universal muffler designed for 4-inch or 5-inch diesel exhaust systems. Please check your current pipe diameter before purchase.

Will it make my truck louder?
It is designed to provide a deeper and more aggressive diesel tone while helping reduce harsh rasp and unwanted resonance.

Is this muffler suitable for towing and heavy-duty use?
Yes. The T409 stainless steel body and heat-resistant internal materials are designed for demanding diesel truck applications.

Do diesels need special mufflers?
Diesel trucks benefit from mufflers designed for high exhaust flow and heat resistance, like this straight-through stainless steel diesel muffler.

Can you put a muffler on a diesel?
Yes. A diesel muffler can be added to help control sound while maintaining strong exhaust flow and performance.

Shipping & Delivery Policy

At DieselPerf, we specialize in high-performance diesel emission system accessories. Our mission is simple: to deliver the parts you need with maximum efficiency, security, and transparency. Below are the guidelines we follow to ensure your order reaches you safely.

1. Perfecting Your Delivery

To ensure a seamless experience and avoid unnecessary surcharges, please keep the following in mind:

Precision Matters: Always verify your shipping address at checkout. Accurate data prevents costly rerouting fees.
Address Classification: Carriers determine rates based on zoning. If your business is located in a residential area, it will be classified and billed at the Residential Delivery rate.
Stay Reachable: Please provide a valid phone number. Carriers often need to coordinate delivery windows; missed connections can lead to significant delays.

2. Order Consolidation

To get your parts to you as fast as possible, we ship items as they become available. This means your order may arrive in multiple packages. Rest assured, you will never be charged extra for these split shipments.

3. Our Logistics Network

We partner with world-class carriers, including UPS, FedEx, DHL, USPS, and Amazon Logistics.

Global Fulfillment: We fulfill orders from our strategic hubs in the U.S. and Hong Kong, prioritizing the location closest to you.
Lead Times: While most orders arrive within 5–15 business days, specialty items or factory-direct shipments may require additional transit time.

4. Damaged or Missing Shipments

Your satisfaction is our priority. If your order arrives compromised, please follow this protocol:

For Damaged/Incomplete Deliveries:

Document Immediately: Note any visible damage or missing pieces on the delivery receipt before signing.
Contact Us: Reach out within 2 business days at service@DieselPerf.com or via phone at +1 325-013-1608 / +852 5381 0098.
Preserve Evidence: Keep all original packaging and take clear photos of the damage to expedite your claim.

For Lost Shipments:
If a package goes missing, we will initiate a dock check with the carrier (typically taking 2–7 business days). If the items cannot be located, we will work with you to provide a full replacement or a refund.

5. Estimated Timeframes

Processing: Orders are generally dispatched from our warehouse within 1–2 business days.
Transit: Standard U.S. ground shipping typically takes 7–10 business days, though many items arrive sooner.
Holiday & External Factors: Please account for seasonal peaks (Christmas, Thanksgiving, etc.) and unforeseen "Force Majeure" events like extreme weather, which may naturally extend delivery windows.

Customer Support

Our team is here to help you get back on the road.

Hours: Monday – Friday | 9:00 AM – 6:00 PM
Email: service@DieselPerf.com

All Dieselperf products enjoy a 1-year limited warranty starting from the date of goods receipt, covering defects in product materials and workmanship.

Warranty Coverage

This warranty only covers failures arising from original material and manufacturing defects under proper installation and normal use. The warranty is non-transferable and exclusively available to the original buyer. An order number or valid purchase receipt is mandatory for warranty claims.

Warranty Exclusions

The 1-year limited warranty does not apply to the following circumstances:

Normal wear and tear and surface scratches generated during regular use
Damage caused by improper installation, unauthorized disassembly or modification
Damage resulting from misuse, accidental impact, negligence and natural disasters
Natural aging loss of consumable spare parts
Labor costs incurred from product disassembly, assembly and maintenance

Warranty Claim Process

Submit Application: Email customer service with your order number, detailed fault description and clear photos or videos of product defects.
Claim Review: Our technical team will verify the issue. Additional information or product return inspection may be required.
Settlement Solutions: Upon claim approval, we reserve the right to take one of the following measures:

Repair the defective product
Replace with a brand-new authentic item
Deliver compatible replacement parts for repair

Limitation of Liability

Within the scope permitted by law, Dieselperf shall not be responsible for any special, incidental, indirect or consequential losses, including but not limited to profit losses, business suspension losses and other economic damages.