Choosing the Best Performance Exhaust System for Ford Mustang GT: These Systems Optimize Flow for the Mach 1 and GT Models

Our Verdict and How We Chose

The BORLA 140458 Ford Mustang GT Mach 1 Exhaust is the best Performance Exhaust Kit for Ford Mustang GT because it features a Dual Split configuration in T-304 Stainless Steel.

Choosing a performance exhaust for a Mustang GT often leads to “drone” issues where a constant hum ruins the driving experience at highway speeds. Many owners struggle to find a balance between a deep, aggressive note and a cabin that remains quiet enough for conversation.

The BORLA 140458 Ford Mustang GT Mach 1 Exhaust solves this by utilizing a Dual Split design that prioritizes resonance control. You should opt for the BORLA 140067 if you prefer an S-Type Dua configuration, or choose the BORLA 11806 if you need a more budget-friendly stainless steel setup.

At Carworship we evaluated the performance exhaust system options we track against this topic’s criteria.

You can find our full review of the MagnaFlow 16518 to see how it handles high-performance demands.

Full Comparison Table

Prices are approximate and move frequently – check the current price before deciding. “Not stated” means the manufacturer listing does not give that figure – we do not estimate it.

The Picks Reviewed in Detail

The 3 picks below run from $491.79 to $1249.99, reviewed in rank order.

BORLA 140458 Ford Mustang GT Mach 1 Exhaust

The BORLA 140458 Ford Mustang GT Mach 1 Exhaust made this list because it provides a specific dual split configuration tailored for the Mach 1 and GT models. It offers a high-end performance balance for owners seeking a more aggressive exhaust note without sacrificing daily drivability.

What we like: This system uses T-304 stainless steel, which is the industry benchmark for corrosion resistance and structural integrity. The “No Drone Guarantee” and all-welded construction provide a specific engineering focus on eliminating the resonance that often plagues high-flow systems at highway speeds.

Keep in mind: At the $1,097.99 price point, this system is a premium choice that may be outside the budget of those seeking a basic muffler swap.

BORLA 140067 Ford Mustang GT Mach 1 Exhaust

The BORLA 140067 Ford Mustang GT Mach 1 Exhaust is included for its S-Type Dual configuration, which offers a different acoustic profile than the standard split designs. It serves as a mid-range performance option specifically engineered for the Mustang GT’s output requirements.

What we like: The S-Type Dual configuration provides a distinct sound signature while maintaining the T-304 stainless steel construction standard. It maintains a 4.1 rating from 76 ratings, indicating consistent performance across a large pool of owners.

Keep in mind: This configuration is specifically for the Mach 1 and GT; owners of other Mustang trims should verify their specific sub-model compatibility before ordering.

BORLA 11806 Ford Mustang GT Exhaust

The BORLA 11806 Ford Mustang GT Exhaust is our most accessible option, providing a classic Borla sound and a direct-fit bolt-on solution for the GT. It serves as the entry point for owners who want a significant upgrade over the factory exhaust without the higher costs of specialized Mach 1 kits.

What we like: This system is priced at $491.79, making it a high-value entry into the performance category. It still utilizes T-304 stainless steel and an all-welded construction to ensure the system handles heat and vibrations reliably.

Keep in mind: This model provides the “Classic” sound rather than the specific S-Type or Dual Split configurations, which may not suit buyers seeking a specific aggressive note.

Axle-Back vs. Cat-Back Systems

The difference between an axle-back and a cat-back system for a Mustang GT depends on how much of the exhaust path you modify. An axle-back system replaces only the muffler and tips, which minimizes labor and cost, while a cat-back system replaces everything from the catalytic converter back to ensure optimal flow and a more consistent sound profile.

Managing Drone and Growl

The best balance between a deep growl and a loud drone at highway speeds is found in systems that utilize specific resonator geometry and “No Drone” engineering. Because the data for these specific Borla kits emphasizes a drone-free experience, they are designed to prevent the poorly tuned resonance that creates a constant cabin hum. If a system does not explicitly guarantee a drone-free experience, you should check the specific pipe diameter and resonator placement in the technical specs to ensure it won’t create backpressure or resonance at high RPMs.

For a deeper dive into the specs, see our breakdown of the MagnaFlow 16869.

Consider the ]BORLA 11795 Exhaust review if you are looking for a premium axle-back setup.

The Specs That Decide This Purchase

Mach 1 Compatibility

Mach 1 compatibility depends on the specific mounting points of your Ford Mustang GT, so confirm your sub-model before ordering. Buyers often order a system that fits a standard GT but lacks the specific Mach 1 hangers, requiring custom welding. The Borla 140458 and Borla 140067 both provide direct-fit bolt-on installation specifically for the Mach 1. These systems ensure the exhaust bolts directly to factory hangers without modification. If you have a standard GT rather than a Mach 1, check the manufacturer’s fitment notes to see if the hangers are shared.

Exhaust Note Pitch

Exhaust note pitch is determined by the internal geometry and the specific muffler design. If you prefer a deeper, more aggressive tone, the Borla 11806 offers a classic BORLA sound. For a more refined profile, the Borla 140067 features an S-Type Dual configuration. The Borla 140458 utilizes a Dual Split design to balance volume and tone. These systems are designed to be street-legal and will not trigger a check engine light (CEL) or fail emissions tests as they maintain the necessary flow characteristics for the engine’s sensors.

Pipe Diameter

Pipe diameter dictates the flow rate, where larger diameters reduce backpressure to improve high-RPM power. While specific diameter measurements vary by sub-model, the T-304 Stainless Steel used in the Borla 140458 and Borla 140067 provides the structural integrity needed for high-flow performance. A high-quality system like these typically costs between $491 and $1,250, whereas budget brands often use thinner-gauge steel that can collapse under heat or restrict flow over time. Verify the exact diameter for your specific year of Mustang GT before purchasing to ensure it matches the factory flow requirements.

Weight Reduction

Weight reduction is achieved through the use of high-grade materials like T-304 Stainless Steel, which is the industry benchmark for corrosion resistance and structural integrity. All three systems—the Borla 140458, Borla 140067, and Borla 11806—feature all-welded construction to maintain durability while reducing mass compared to heavy stock systems. Because these systems are made in the USA from T-304 Stainless Steel, they offer a balance of weight savings and long-term durability that cheaper, thinner-walled alternatives lack.

Drone Frequency

Drone frequency is a common issue where poorly tuned resonance creates a constant cabin hum at highway speeds. We selected these three products because they include a No Drone Guarantee, which separates them from many other performance options. The Borla 140458 and Borla 140067 use specific muffler geometry to dampen unwanted vibrations. If you find a system with a high drone frequency, it usually indicates the internal baffling is insufficient for the Mustang’s engine displacement.

Beginners should visit our plain English guide to exhaust specs to understand the technical jargon.

What You Need vs What These Picks Deliver

Match the job you actually need done to what it requires, then check whether anything on this page reaches that level. Where nothing does, the row says so.

Thresholds are the levels this category is generally held to, not manufacturer claims. Check them against your own workload before buying.

Who Buys Performance Exhaust Systems, and What It Really Costs

Buying Questions Answered

How much horsepower and torque can I expect from these systems?

Performance exhaust systems for the Ford Mustang GT focus on improving flow and resonance rather than massive dyno gains. While these systems improve the engine’s ability to breathe at high RPMs, you should expect a noticeable increase in throttle response and exhaust note rather than a specific high-horsepower figure. Because dyno results vary based on engine tuning and other modifications, you should verify expected gains with a local tuner who can provide data specific to your vehicle’s configuration.

Do I need to modify my factory hangers or brackets for fitment?

The BORLA 140458, 140067, and 11806 systems are designed as bolt-on installations to ensure they align with the Ford Mustang GT chassis. You do not need to modify your factory hangers or brackets to install these specific units. However, you should confirm your vehicle’s subframe and hanger configuration matches the factory specifications before ordering, as a qualified installer should perform the final mounting to ensure proper alignment.

Which exhaust system should I choose for my specific Mustang GT?

You should choose based on your preferred configuration and budget. The BORLA 140458 offers a Dual Split configuration for $1097.99, while the BORLA 140067 provides an S-Type Dua setup for $1249.99. If you prefer a more budget-friendly entry point, the BORLA 11806 offers a classic sound for $491.79.

Is the BORLA 140067 worth the higher price point?

You should consider the 140067 if you prioritize a specific S-Type Dua exhaust configuration over a standard dual split. While it costs $1249.99, it provides a distinct sound profile and flow path compared to the other options we evaluated.

Learn which metal is right for your build by viewing our guide on exhaust material grades.

Who Should Skip These Performance Exhaust Systems

The Borla 11806 Ford Mustang GT Exhaust offers a more accessible entry point at the $491.79 mark. It utilizes T-304 stainless steel and an all-welded construction. While it lacks the specific Mach 1 tuning of the other two models, it provides the standard stainless steel durability required for a performance upgrade.

If you require a cat-back system that replaces the catalytic converter for maximum flow, these specific kits may not meet your requirements as they focus on the downstream configuration. For systems that replace everything from the catalytic converter back, see best axle-back performance exhaust system.

If you are looking for high-end racing components like Inconel or Titanium, these T-304 stainless steel options do not reach that material tier. These systems are designed for street-legal performance and do not provide the extreme weight savings of racing-grade metals.