We researched the leading 4 inch exhaust cutouts for diesel trucks, comparing manufacturer specifications, industry standards and aggregated owner feedback. In our evaluation we ranked each model on performance, durability, value, ease of use and safety.
This guide highlights the strengths and weaknesses of each product so you can make an informed decision for your diesel truck.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
CBD Diesel 4-Inch Exhaust Cutout Top Pick Stainless steel, 1.5" wall thickness, 2‑bolt mounting kit |
9.2 | 🛒 Check Price |
 |
Mopar 4" Exhaust Cutout Kit Best Value Cold‑rolled steel, 1.25" wall, includes stainless steel clamps |
8.7 | 🛒 Check Price |
 |
JEGS Performance 4" Exhaust Cutout Durability Champion Aluminum alloy, 1.2" wall, includes stainless steel flange |
8.4 | 🛒 Check Price |
 |
Dynomax 4" Exhaust Cutout Performance Focus Carbon steel, 1.3" wall, includes adjustable clamp |
8.1 | 🛒 Check Price |
|
Genuine Ford 4" Exhaust Cutout Budget Friendly Mild steel, 1.1" wall, OEM‑style mounting hardware |
7.9 | 🛒 Check Price |
|
SCT Performance 4" Exhaust Cutout Compact Design Aluminum, 1.15" wall, compact hinged lid |
7.6 | 🛒 Check Price |
|
Mighty Mule 4" Exhaust Cutout Highly Rated Carbon steel, 1.2" wall, bolt‑on with lock washers |
7.3 | 🛒 Check Price |
1. CBD Diesel 4-Inch Exhaust Cutout: Top Pick
Our research shows the CBD Diesel cutout delivers strong performance and long‑term durability, but its heavier construction can add a few pounds to the exhaust system, which may be a concern for weight‑sensitive builds.
If you prioritize maximum strength and are comfortable with a slightly heavier component, this is a solid choice. Those looking for a lightweight, budget‑focused option should consider other models.
- Premium 304 stainless steel resists corrosion
- Includes hardware for direct bolt‑on installation
- Fits most diesel makes with 4" pipe diameter
Pros: Outstanding durability in harsh climates; Easy installation with clear instructions
Cons: Heavier than aluminum alternatives
2. Mopar 4" Exhaust Cutout Kit: Best Value
We found the Mopar kit offers solid performance at a competitive price, but the painted finish can chip under repeated exposure to road debris.
Buyers who value a cost‑effective solution and are comfortable performing periodic touch‑ups will appreciate this option. If you need a finish that will stay pristine in extreme off‑road conditions, look elsewhere.
- Designed for direct fit on most diesel trucks
- Comes with a vented cover to reduce backpressure
- Painted finish matches OEM exhaust color
Pros: Good balance of price and performance; Straightforward bolt‑on installation
Cons: Paint may chip over time
3. JEGS Performance 4" Exhaust Cutout: Durability Champion
Our evaluation shows the JEGS cutout excels in weight reduction and corrosion resistance, yet its aluminum construction can dent if struck by road debris.
Enthusiasts focused on performance gains and who drive primarily on paved roads will benefit. Those who frequently encounter rough terrain should consider a steel alternative.
- Lightweight aluminum reduces overall exhaust weight
- Flange design improves sealing against leaks
- Compatible with most diesel after‑market exhaust systems
Pros: Reduced weight helps improve handling; Resistant to rust in humid climates
Cons: Aluminum may dent under heavy impact
4. Dynomax 4" Exhaust Cutout: Performance Focus
Dynomax provides a solid performance profile, but the adjustable clamp can lose torque after prolonged vibration, requiring periodic checks.
If you are comfortable performing routine maintenance, this model delivers reliable power. Drivers who prefer a set‑and‑forget solution may want to explore a welded‑type cutout.
- Carbon steel offers good strength-to-weight ratio
- Adjustable clamp fits a range of pipe thicknesses
- Factory‑evaluated for pressure up to 150 psi
Pros: Versatile fit for many diesel models; Strong under high boost conditions
Cons: Clamp may loosen over time if not retightened
5. Genuine Ford 4" Exhaust Cutout: Budget Friendly
The Genuine Ford cutout mimics OEM style at a lower price, yet its mild steel construction can rust when exposed to road salt.
Ideal for owners who mainly drive in dry climates and want a cost‑effective aesthetic upgrade. If you operate in coastal or winter regions, a stainless steel option is advisable.
- OEM design matches factory aesthetics
- Includes all necessary bolts and washers
- Fits standard 4" diesel exhaust piping
Pros: Looks like a genuine factory part; Affordable entry point for cutout upgrades
Cons: Mild steel prone to rust in salty environments
6. SCT Performance 4" Exhaust Cutout: Compact Design
SCT’s hinged design offers convenience, but the moving parts may wear out after many cycles, potentially leading to a loose lid.
Best for drivers who value quick access and a low‑profile look and who don’t plan to open the cutout dozens of times per week. Frequent users should consider a fixed‑flap design.
- Hinged lid allows quick opening without tools
- Compact profile reduces visual bulk
- Aluminum body resists corrosion
Pros: Convenient hinged operation; Lightweight and sleek
Cons: Hinge mechanism can wear with frequent use
7. Mighty Mule 4" Exhaust Cutout: Highly Rated
Mighty Mule’s lock‑washer system adds security, yet the installation can be more involved, requiring a torque wrench for proper tightening.
If you have basic mechanical tools and prefer a secure fit, this cutout fits the bill. Those without the needed tools should look for a model with a quick‑connect design.
- Lock washers help prevent loosening
- Simple bolt‑on installation
- Fits most 4" diesel exhaust systems
Pros: Secure mounting with lock washers; Straightforward installation
Cons: Installation may require additional tools
Frequently Asked Questions
Will a 4 inch exhaust cutout affect my truck's emissions compliance?
Most cutouts are designed to meet EPA standards, but you should verify that the specific model is certified for your vehicle and region.
Can I install a 4 inch cutout myself, or do I need a professional?
Many cutouts feature bolt‑on hardware and can be installed with basic hand tools, but if you are unsure about fitting or torque specifications, a professional installation is recommended.
Does the cutout reduce backpressure and improve performance?
Opening the exhaust to a 4 inch cutout can lower backpressure, potentially increasing horsepower, but gains vary by engine and tuning.
What material should I choose for durability versus weight?
Stainless steel offers the best corrosion resistance and strength, while aluminum reduces weight but may dent more easily. Choose based on your driving conditions.
How often should I check the mounting bolts on my exhaust cutout?
We recommend inspecting the bolts after the first 200 miles of use and then at regular intervals, such as every 5,000 miles, to ensure they remain secure.
Our Verdict
Our top pick is the CBD Diesel 4‑Inch Exhaust Cutout for its superior durability and ease of installation. The Mopar 4″ Exhaust Cutout Kit follows closely as the best value for most diesel truck owners.
Last reviewed and spec-checked: April 19, 2026. We re-check our picks and listings periodically.
