A strong 4-inch exhaust brake should match your vehicle and exhaust setup first, then provide the braking design and controls your application requires. For Ram and Cummins owners, the listed options range from electronic brakes specified for particular model years to an air-operated remote-mount unit and a brake for trucks with non-VGT turbochargers. The BD Diesel 07.5-17 RAM 2500/3500 6.7L Electronic Exhaust Brake 4.0in leads because its listing directly identifies a 4.0-inch brake and a clear truck and engine fit range.
Other choices cover newer Ram applications, an older 5.9L Ram, or a replacement-style brake. Check model-year and turbocharger compatibility carefully: a matching exhaust diameter alone does not establish that a brake will work with your vehicle.
The BD Diesel 07.5-17 RAM 2500/3500 6.7L Electronic Exhaust Brake 4.0in is the strongest overall match because its title specifies a 4.0-inch electronic brake for 2007.5–2017 Ram 2500/3500 trucks with a 6.7L engine. For later trucks, the BD Diesel 13-24 Dodge Ram 2500/3500 Cummins Electronic Exhaust Brake 4.in lists a newer fit range. Buyers with a non-VGT turbo should instead consider the BD POWER Inline Exhaust Brake, which is listed for 2007.5–2012 6.7L Cummins applications and 4- or 5-inch exhaust systems.
Our Top Picks
Best OverallBD Diesel 07.5-17 Electronic Brake
Its listing specifies a 4.0-inch electronic brake for 2007.5–2017 Ram 2500/3500 trucks with a 6.7L engine, making fit unusually clear.
View on Amazon
Newer Ram FitBD Diesel 13-24 Electronic Brake
This electronic 4-inch brake is listed for 2013–2024 Ram 2500/3500 Cummins trucks, covering a later application range than the top pick.
View on Amazon
Replacement FitPart Synergy 18-23 Replacement Brake
The listing identifies a 4-inch electronic replacement for 2018–2023 Ram 2500/3500 6.7L Cummins engines and describes direct replacement fit.
View on Amazon- Older Ram Fit Pacbrake DirectMount PRXB
- Non-VGT Option BD POWER Inline Exhaust Brake
Compare the 4-Inch Exhaust Brake Options
| # | Product | Weight | Buy |
|---|---|---|---|
| 1 | 1. BD Diesel 07.5-17 Electronic BrakeBest Overall | 16.43 lb | View on Amazon |
| 2 | 2. BD Diesel 13-24 Electronic BrakeNewer Ram Fit | 17 lb | View on Amazon |
| 3 | 3. Part Synergy 18-23 Replacement BrakeReplacement Fit | — | View on Amazon |
| 4 |  4. Pacbrake DirectMount PRXBOlder Ram Fit | 23 lb | View on Amazon |
| 5 |  5. BD POWER Inline Exhaust BrakeNon-VGT Option | — | View on Amazon |
| 6 |  6. BD Diesel Remote-Mount Air BrakeRemote-mount air-brake installations | — | View on Amazon |
Detailed Reviews: Best 4 Inch Exhaust Brake
#1 · Best Overall
1. BD Diesel 07.5-17 Electronic Brake
- Weight: 16.43 lb
Best for: 2007.5–2017 Ram 6.7L owners.
Why it ranks #1: Its listing specifies a 4.0-inch electronic brake for 2007.5–2017 Ram 2500/3500 trucks with a 6.7L engine, making fit unusually clear.
A 4.0-inch electronic exhaust brake for 2007.5–2017 Ram 2500 and 3500 trucks with a 6.7L engine gives this application-specific option a clear fit range. BD positions its exhaust-brake lineup for hauling and highway use, making this a candidate for owners seeking braking support while carrying loads or traveling.
The listed Ram 2500/3500 and 6.7L application narrows the intended vehicle fit, while the 4.0-inch size identifies the exhaust-brake configuration. Its electronic designation distinguishes the unit as an electronic brake rather than an air remote-mount assembly. BD describes its broader exhaust-brake products for hauling and highway cruising, so those are relevant use cases; the supplied listing does not provide installation steps, controls, or a braking-performance figure for this specific model.
- 4.0-inch electronic exhaust brake
- Listed for 2007.5–2017 Ram 2500/3500
- Specified for 6.7L engines
- BD identifies hauling and highway cruising as relevant use cases
- The supplied listing gives no braking-performance figure for this specific model.
Skip it if you have a 2018–2023 Ram 2500/3500 6.7L; Part Synergy’s 4-inch replacement lists that later application.
This suits owners of a listed 2007.5–2017 Ram 2500 or 3500 with a 6.7L engine who want an electronic exhaust brake for hauling or highway use. The stated year and engine range are the key fit boundaries.
Full product details
| Brand | BD |
|---|---|
| Item Weight | 16.43 pounds |
| Item model number | 1027346 |
| Manufacturer | BD Diesel |
| Part Number | 1027346 |
| Model | BD Diesel 07.5-17 RAM 2500/3500 6.7L Electronic Exhaust Brake 4.0in |
| Dimensions | 18.25 x 10.05 x 7.5 inches |
| Additional Information | Important Information Proposition 65 Warning for California Consumers WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
Listed on Amazon as: BD Diesel 07.5-17 RAM 2500/3500 6.7L Electronic Exhaust Brake 4.0in
View on Amazon#2 · Newer Ram Fit
2. BD Diesel 13-24 Electronic Brake
- Weight: 17 lb
Best for: 2013–2024 Ram Cummins fit.
Why it ranks #2: This electronic 4-inch brake is listed for 2013–2024 Ram 2500/3500 Cummins trucks, covering a later application range than the top pick.
A stated 2013–2024 fit for Dodge Ram 2500 and 3500 Cummins trucks is the defining feature of this BD Diesel electronic exhaust brake. Its 4-inch designation identifies the exhaust size, giving owners in that vehicle range a specific application to consider for engine-braking needs.
The listing names Ram 2500/3500 Cummins trucks from 2013 through 2024, which gives buyers a broad stated model-year and vehicle range to check against their truck. The 4-inch electronic exhaust-brake designation identifies both the exhaust size and brake type. However, the supplied product information identifies the included components as the main component only and provides no installation instructions or braking-performance figures, so plan around that limited scope of detail.
- Listed for 2013–2024 Dodge Ram 2500/3500
- Specified for Cummins trucks
- 4-inch electronic exhaust brake
- Included components are identified as the main component
- The listing specifies the main component only, not a complete installation kit.
Skip it if you need an exhaust brake explicitly listed for 4- or 5-inch systems on a non-VGT 2007.5–2012 Ram; BD POWER’s inline model names that setup.
This is for Ram 2500/3500 Cummins owners within the listed 2013–2024 range seeking a 4-inch electronic brake. Account for the main-component-only listing when planning installation and sourcing any additional parts.
Full product details
| Brand | BD DIESEL |
|---|---|
| Included Components | Main component only |
| Item Weight | 17 pounds |
| Manufacturer | BD Diesel |
| Part Number | 1027348 |
| Manufacturer Warranty Description | Please contact us if you experience any issues within 30 days of receipt. |
| Model Number | 1027348 |
Listed on Amazon as: BD Diesel 13-24 Dodge Ram 2500/3500 Cummins Electronic Exhaust Brake 4.in
View on Amazon#3 · Replacement Fit
3. Part Synergy 18-23 Replacement Brake
Best for: 2018–2023 Ram replacement fit.
Why it ranks #3: The listing identifies a 4-inch electronic replacement for 2018–2023 Ram 2500/3500 6.7L Cummins engines and describes direct replacement fit.
A stated direct-replacement fit for 2018–2023 Ram 2500/3500 6.7L Cummins trucks is the key feature of this Part Synergy 4-inch electronic exhaust brake. The listing says it matches original component fit and function, aiming to support compatibility and a straightforward replacement installation.
The 4.0-inch control and named 2018–2023 Ram 2500/3500 6.7L application establish the stated size and vehicle range, helping buyers assess whether it matches their replacement need. Part Synergy also describes the part as a direct replacement matching original fit and function, linking that claim to its stated straightforward-installation benefit. Its listed dimensions are 7.5 x 18.25 x 9.31 inches; the supplied details do not provide braking-performance figures.
- 4.0-inch electronic exhaust brake
- Listed for 2018–2023 Ram 2500/3500 6.7L Cummins
- Described as matching original fit and function
- Hassle-free installation is a listed special feature
- The listed warranty information is limited to 30-day returns accepted.
Skip it if you have a 2007.5–2017 Ram 2500/3500 6.7L; BD Diesel’s 07.5–17 electronic brake lists that earlier range.
This suits 2018–2023 Ram 2500/3500 6.7L Cummins owners replacing an electronic exhaust brake with a listed 4-inch direct-fit part. Its stated model years and engine application define the relevant fit boundary.
Full product details
| Brand | Part Synergy |
|---|---|
| Item Dimensions | 7.5 x 18.25 x 9.31 inches |
| Dimensions | 7.5 x 18.25 x 9.31 inches |
| Manufacturer | BDD – Bd Diesel |
| Part Number | BDD – 1027348 |
| Manufacturer Warranty Description | 30 Days Return Accepted |
| Model Number | BDD – 1027348 |
| Special Features | Hassle-free installation, Reliable Performance |
| Special Feature | Hassle-free installation, Reliable Performance |
| Additional Information | Important Information Small parts. Not for children under 3 yrs. |
Listed on Amazon as: Part Synergy Replacement for 4" Electronic Exhaust Brake for 18-23 RAM 2500/3500 6.7L Cummins – 1027348
View on Amazon#4 · Older Ram Fit
4. Pacbrake DirectMount PRXB
- Weight: 23 lb
Best for: Low-RPM 5.9L Ram holdback.
Why it ranks #4: This 4-inch PRXB is specified for Ram 4.5–2005 5.9L applications, with a spring-controlled pressure regulator described as protecting against overpressure.
Pacbrake’s PRXB specifies 50 percent more braking power at lower RPMs, with its strongest holdback stated for the 1400–1800 RPM range. That targets typical driving speeds for the listed Ram 4.5–05 5.9L application, giving buyers a concrete low-RPM braking focus.
The spring-controlled pressure-regulated mechanism is described as protecting against engine overpressure, connecting its regulation to an engine-protection benefit. Pacbrake also states the PRXB provides 50 percent more braking power at lower RPMs and greatest holdback at 1400–1800 RPM, where it says drivers typically operate. Those figures point to the intended operating range; the supplied information does not specify installation steps or further vehicle compatibility beyond the listed Ram 4.5–05 5.9L application.
- 4-inch PRXB exhaust brake
- 50 percent more braking power at lower RPMs, as stated
- Strongest holdback specified at 1400–1800 RPM
- Spring-controlled pressure regulation protects against engine overpressure
- Its stated vehicle application is limited to Ram 4.5–05 5.9L models.
Skip it if you have a 2007.5–2012 non-VGT Ram 6.7L Cummins; BD POWER’s inline brake lists that application and 4-inch exhaust compatibility.
This fits buyers considering the listed Ram 4.5–05 5.9L application who value holdback in the 1400–1800 RPM range. Treat that stated vehicle range as the boundary; the supplied details do not establish broader compatibility.
Full product details
| Brand | Pacbrake |
|---|---|
| Compatible with Vehicle Type | Car |
| Item Weight | 23 pounds |
| Manufacturer | Pacbrake |
| Part Number | C44033 |
| Model Number | C44033 |
| Additional Information | Important Information Proposition 65 Warning for California Consumers WARNING: Cancer – www.P65Warnings.ca.gov |
Listed on Amazon as: DirectMount 4 inch PRXB High Performance Exhaust Brake For Ram 4.5-05 5.9L
View on Amazon#5 · Non-VGT Option
5. BD POWER Inline Exhaust Brake
Best for: Non-VGT Cummins turbo conversions.
Why it ranks #5: It fits 4- or 5-inch exhaust on 2007.5–2012 6.7L Cummins trucks without VGT turbos and retains the OEM dash-button functionality.
Variable Orifice Technology gives this BD POWER inline brake a way to regulate back pressure across the RPM range, supporting speed control on steep descents. It is listed for 2007.5–2012 Ram 6.7L Cummins trucks without VGT equipment and accepts 4-inch or 5-inch exhaust systems.
The inline layout integrates into the existing exhaust system, while the listing says it retains the OEM dash button, helping preserve the original control workflow after a factory VGT-style turbocharger replacement. Its cast-iron construction is specified for heat resistance, and air-compressor-free operation reduces maintenance and failure points. BD cites up to 150 horsepower of retarding capability and consistent back-pressure regulation across RPM, making steep-descent speed control its stated use case.
- Fits 4-inch or 5-inch exhaust systems
- Retains OEM dash-button functionality
- Air-compressor-free operation
- Variable Orifice Technology regulates back pressure across the RPM range
- It is specified for non-VGT-equipped trucks, not factory VGT configurations.
Skip it if you have a 2013–2024 Ram 2500/3500 Cummins; BD Diesel’s 13–24 electronic brake lists that newer application.
Choose this for a 2007.5–2012 Ram 6.7L Cummins with a non-VGT turbo setup and a 4- or 5-inch exhaust, especially for descent control. Its stated non-VGT fit is the central compatibility boundary.
Full product details
| Brand | BD POWER |
|---|---|
| Part Number | 1027346 |
Listed on Amazon as: Inline Exhaust Brake for 4" or 5" Exhaust, Non-VGT Equipped 07.5-12 Ram 6.7L Cummins
View on Amazon#6
6. BD Diesel Remote-Mount Air Brake
Best for: Remote-mount air-brake installations.
Why it ranks #6: The listing specifies a 4-inch remote-mount air brake and includes an air compressor, valve assembly, tubing, switch kit, regulator and mounting hardware, but gives no vehicle fit range.
An included air compressor, valve assembly, tubing, adapter, toggle switch kit, regulator, control assembly, and mounting hardware make this BD remote-mount brake a kit-oriented option. Its title specifies a 4-inch exhaust size, giving buyers a defined system size and a substantial set of listed components.
The remote-mount configuration and included air compressor, valve assembly, and tubing identify an air-operated installation approach rather than an electronic-only unit. The supplied toggle switch kit, regulator, control assembly, and mounting hardware offer named installation components, while the 4-inch exhaust-size specification sets the stated system size. Product details do not give a vehicle application, performance figure, or installation procedure, so buyers should treat those as unresolved within this listing.
- Remote-mount air exhaust brake
- Specified for 4-inch exhaust size
- Includes air compressor, valve assembly, and air tubing
- Includes toggle switch kit, regulator, control assembly, and mounting hardware
- The supplied listing does not identify a vehicle application.
Skip it if you need a brake with a stated Ram 6.7L vehicle fit; BD Diesel’s 07.5–17 electronic model lists Ram 2500/3500 compatibility.
This is suited to buyers assembling a remote-mount air-brake installation for a 4-inch exhaust who value the listed compressor and control components. The listing provides no vehicle application, so that fit detail remains a boundary.
Full product details
| Brand | BD |
|---|---|
| Part Number | 1028140 |
| Dimensions | 23 x 16 x 11 inches |
Listed on Amazon as: BD Diesel 1028140 Exhaust Brake; Air; Remote Mount; 4 in. Exhaust Size; Incl. Air Compressor/Valve Assy/Air Tubing/Adapter/Toggle Switch Kit/Regulator And Control Assy/Mounting Hardware;
View on AmazonWhy exhaust diameter alone is not a fit check
A 4-inch exhaust connection does not, by itself, confirm vehicle compatibility. These listings show why: the BD Diesel 07.5-17 Electronic Brake specifies Ram 2500/3500 6.7L applications, while the Pacbrake DirectMount PRXB targets an older Ram 5.9L. The BD POWER Inline Exhaust Brake has another crucial qualifier: it is for 2007.5–2012 6.7L Cummins trucks that are non-VGT equipped.
Its listing says the setup is intended for owners who replaced the factory VGT-style turbocharger. Before ordering, verify the exact truck year, engine, turbo configuration, exhaust diameter and connection requirements against the manufacturer’s fitment information.
Do not infer that a product fits simply because its title includes “4 inch” or because the truck has a Cummins engine. Where listings give conflicting or incomplete model-year details, confirm compatibility with the seller or manufacturer before purchase.
Electronic versus air-operated brake trade-offs
The listings show different control and hardware approaches, so buyers should compare the system type as well as the exhaust size. Several options are described as electronic brakes, and the BD POWER Inline Exhaust Brake specifically says it uses the original turbocharger connector and keeps OEM dash-button functionality. By contrast, the BD Diesel Remote-Mount Air Brake is explicitly air-operated and lists an air compressor, valve assembly, tubing, toggle switch kit, regulator, control assembly and mounting hardware.
That included hardware may suit a buyer seeking a remote-mount air system, but it also means the installation involves more listed components than the electronic choices. Product data does not establish installation time, wiring details, or whether every component is suitable for a particular truck.
Treat control type and required connections as compatibility questions to resolve before selecting a brake.
How to Choose a 4-Inch Exhaust Brake
Vehicle, engine and model-year fit
Look for a listing that names your truck, engine and model years, not just a 4-inch exhaust connection. The options span 2007.5–2017 Ram 2500/3500 6.7L, 2013–2024 Ram 2500/3500 Cummins, 2018–2023 Ram 2500/3500 6.7L Cummins, and an older Ram 5.9L application. The BD POWER inline model is narrower still: 2007.5–2012 6.7L Cummins with a non-VGT turbo.
Choose the listing that explicitly matches your vehicle’s configuration; buyers with trucks outside a stated range should verify fitment rather than extrapolating from a similar engine or exhaust diameter.
Exhaust size and turbo configuration
Confirm both pipe diameter and turbo configuration before choosing a brake. Most relevant listings specify a 4-inch unit, while the BD POWER Inline Exhaust Brake accepts 4- or 5-inch exhaust but is limited to non-VGT-equipped 2007.5–2012 Ram 6.7L Cummins applications. The other product titles identify 4-inch brakes but give different vehicle fit ranges.
A buyer with a qualifying non-VGT truck can consider the inline unit’s broader diameter compatibility; someone with a standard VGT setup should not assume it fits, and should focus on a brake listed for that truck’s configuration. Check exact connections and fitment details with the manufacturer when the listing does not spell them out.
Electronic or air-operated system
Choose a brake system whose controls and included hardware suit your truck and installation plan. The electronic listings include the BD Diesel model for 2007.5–2017 trucks and the BD POWER inline design, which says it retains OEM dash-button functionality. The BD Diesel Remote-Mount Air Brake instead lists an air compressor, valve assembly, air tubing, toggle switch kit, regulator, control assembly and mounting hardware.
An owner seeking the specified OEM button functionality should investigate the applicable electronic option; a buyer seeking an air-operated remote-mount design can consider the listed air unit, while first confirming vehicle fit. The product data does not specify installation labor or wiring requirements, so verify those details before ordering.
Which 4-Inch Exhaust Brake Fits My Ram?
For a 2007.5–2017 Ram 2500/3500 with a 6.7L engine, start with the BD Diesel 07.5-17 Electronic Brake: its listing clearly specifies the 4.0-inch electronic unit and truck range. For a 2013–2024 Ram 2500/3500 Cummins, consider the BD Diesel 13-24 Electronic Brake; the Part Synergy 18-23 Replacement Brake is another explicitly listed 4-inch option for 2018–2023 6.7L Cummins trucks. Owners of a 2007.5–2012 6.7L Cummins with a non-VGT turbo can look at the BD POWER Inline Exhaust Brake.
The Pacbrake DirectMount PRXB targets an older Ram 5.9L. The BD Diesel Remote-Mount Air Brake specifies 4-inch sizing and included air hardware but no vehicle range, so confirm fit before choosing it.
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Frequently Asked Questions
How can I confirm an exhaust brake fits my exact Ram model year and engine?
Match the listing’s stated year range, Ram series, engine, and any turbo requirements against your truck’s details. For example, the first option specifies 2007.5–2017 Ram 2500/3500 trucks with a 6.7L engine. If a listing does not give a vehicle range, confirm fitment before choosing it.
Does replacing a factory VGT turbocharger affect exhaust-brake compatibility?
It can matter: the BD POWER Inline Exhaust Brake is specifically listed for non-VGT-equipped 2007.5–2012 Ram 6.7L Cummins applications. Check the brake listing against your current turbo setup rather than assuming compatibility from the truck’s original configuration. Confirm the fit for your exact application before purchasing.
What installation or wiring work does an electronic exhaust brake require?
The product titles identify these options as electronic exhaust brakes, but do not provide installation steps or wiring details. Check the instructions and fitment information for the specific brake and truck before planning the work. If those details are unclear, ask a qualified installer to verify requirements for your setup.
What should I check before choosing the remote-mount air brake?
Confirm vehicle fit before selecting it, because its listing specifies a 4-inch exhaust size and included air hardware but gives no vehicle range. The listed components include an air compressor, valve assembly, air tubing, adapter, toggle switch kit, regulator and control assembly, and mounting hardware.
Which listed option is intended for an older Ram with a 5.9L engine?
The DirectMount PRXB title identifies an older Ram 5.9L application, making it the option to investigate for that engine. Its title gives the range as 4.5-05, so verify that the truck’s exact model year and configuration fall within the listing’s fitment before choosing it.
Final Words
For a 2007.5–2017 Ram 2500/3500 with a 6.7L engine, the BD Diesel 07.5-17 is the clearest overall match because its title specifies the 4.0-inch electronic brake and truck range. Later-truck owners can compare the BD Diesel 13-24 and Part Synergy 18-23 listings. Non-VGT owners should check the BD POWER Inline option, while older 5.9L owners can investigate the Pacbrake.
Confirm exact fit before ordering.
