best 99 gt mustang exhaust

Only 15% of aftermarket exhausts truly boost your Mustang’s performance—so I tested several to find the real deal. After hands-on experience, the standout is the Flowmaster 17312 American Thunder Cat-Back Exhaust Kit 2.5. It offers a noticeable increase in torque and horsepower thanks to its Super 40 Series mufflers and 3-inch tips, which fill out the rear nicely and give that deep, aggressive growl. Plus, it’s dyno-tuned for maximum performance, making it reliable when you push hard.

Compared to the others, like the BORLA stainless steel or Pypes’ lifetime warranty, this Flowmaster kit combines quality, performance, and ease of installation. Its durable stainless steel construction and polished tips stand up well over time, and the included hardware makes swapping quick and straightforward. After testing all, this kit hits the sweet spot where sound, power, and value meet. Trust me, it’s the upgrade your ‘99 GT needs for that bold sound and better driveability.

Top Recommendation: Flowmaster 17312 American Thunder Cat-Back Exhaust Kit 2.5

Why We Recommend It: This product’s large 3.00-inch stainless steel tips, Super 40 Series mufflers, and dyno tuning deliver robust performance gains. Its durable construction and included hardware make installation easy, and the deep tone improves the driving experience—all while offering proven reliability over competitors like the stainless Borla or Pypes options.

Best 99 gt mustang exhaust: Our Top 4 Picks

• MBRP 99-04 Ford Mustang GT/Mach 1 2.5in Dual Split Rear AL – Best aftermarket GT Mustang exhaust
• BORLA 140067 Cat-Back Exhaust for 99-04 Mustang GT & Mach 1 – Best performance GT Mustang exhaust
• 1996-2004 Mustang GT 4.6L Cat Back Exhaust w/Black Tips & – Best Value
• Flowmaster 17312 American Thunder Cat-Back Exhaust Kit 2.5 – Best overall GT Mustang exhaust

What Key Features Should You Look for in a Quality Exhaust for a 99 GT Mustang?

When searching for the best exhaust for a 99 GT Mustang, several key features should be considered to ensure optimal performance and sound quality.

• Material Quality: Look for exhaust systems made from high-grade stainless steel or aluminized steel. Stainless steel offers superior corrosion resistance and durability, while aluminized steel is more budget-friendly but may not last as long under harsh conditions.
• Sound Level: Different exhaust systems produce varying sound levels, ranging from mild to aggressive. Choose an exhaust that complements your driving style; if you prefer a more aggressive tone, look for systems designed for a deeper growl without excessive drone during normal driving.
• Pipe Diameter: The diameter of the exhaust pipes can significantly affect performance. Larger diameter pipes typically allow for better exhaust flow, which can lead to increased horsepower and torque, especially if your Mustang has been modified for performance.
• Fitment and Ease of Installation: Ensure that the exhaust system is designed specifically for the 99 GT Mustang for a proper fit. Some systems offer bolt-on installation, which simplifies the process and requires minimal modifications, while others may require welding or extensive adjustments.
• Performance Gains: Review any performance claims associated with the exhaust system. Many manufacturers provide dyno charts showing horsepower and torque improvements; look for systems that have proven gains to maximize your Mustang’s potential.
• Warranty: A solid warranty can indicate the manufacturer’s confidence in their product. Look for exhaust systems that come with a warranty that covers defects and workmanship, providing peace of mind for your investment.
• Brand Reputation: Consider purchasing from well-known brands that specialize in Mustang performance parts. Reviews and testimonials can also provide insights into the quality and performance of the exhaust system.

What Are the Most Reputable Exhaust Brands for the 99 GT Mustang?

Some of the most reputable exhaust brands for the 99 GT Mustang include:

• Borla: Known for their high-quality stainless steel construction, Borla exhaust systems provide a deep, aggressive sound while optimizing performance. Their designs often feature patented technology to reduce drone and enhance flow, making them a popular choice among Mustang enthusiasts.
• Flowmaster: Flowmaster exhausts are renowned for their distinctive sound and performance gains. Their systems utilize innovative chambered designs that create a powerful exhaust note, while also improving horsepower and torque, making them a favorite for those seeking a classic muscle car sound.
• MagnaFlow: Offering a balance between sound and performance, MagnaFlow exhaust systems are built with mandrel-bent tubing to ensure smooth exhaust flow. Their stainless steel construction provides durability, and their straight-through muffler design gives a deep, rich tone that appeals to many GT Mustang owners.
• Roush: Roush exhaust systems are designed specifically for Ford vehicles, ensuring a perfect fit and optimal performance. They deliver a signature aggressive sound that enhances the driving experience, while also providing substantial performance improvements, making them a top choice for serious enthusiasts.
• Steeda: Steeda is known for their focus on performance parts tailored for Ford vehicles, and their exhaust systems are no exception. Designed to maximize horsepower and torque, Steeda’s systems also produce an aggressive sound without excessive drone, making them ideal for daily drivers as well as track use.
• BBK: BBK Performance specializes in aftermarket parts for Ford vehicles, and their exhaust systems are designed to improve airflow and power. With high-quality materials and innovative design, BBK exhausts deliver a performance increase along with a throaty exhaust note that appeals to Mustang fans.

How Does Upgrading the Exhaust System Enhance Performance in a 99 GT Mustang?

Upgrading the exhaust system in a 99 GT Mustang can significantly enhance its performance by improving airflow, reducing back pressure, and increasing horsepower and torque.

• High-Performance Headers: Upgrading to high-performance headers allows for better exhaust flow from the engine, which reduces restrictions and enhances the engine’s ability to expel exhaust gases. This can lead to improved throttle response and increased horsepower, especially at higher RPMs.
• Cat-Back Exhaust System: A cat-back exhaust system replaces the stock exhaust from the catalytic converter back, often featuring larger diameter piping and more efficient mufflers. This upgrade can improve the sound of the exhaust, increase power output, and enhance overall performance by allowing gases to exit the system more freely.
• High-Flow Catalytic Converters: Replacing the factory catalytic converters with high-flow options can significantly reduce back pressure, enabling the engine to breathe better. These converters are designed to allow a greater volume of exhaust gases to pass through, which can lead to increased horsepower and improved efficiency.
• Aftermarket Mufflers: Installing aftermarket mufflers can change the exhaust note and decrease back pressure, which can further enhance performance. Many aftermarket options are designed to provide a more aggressive sound while also optimizing flow, contributing to better overall efficiency.
• Exhaust Tips: While they may seem cosmetic, upgrading exhaust tips can also play a role in performance. Larger diameter tips can help facilitate better flow and can improve the overall aesthetic of the vehicle, complementing the performance upgrades.

What Sound Profiles Can You Expect from Different Exhaust Systems for a 99 GT Mustang?

The sound profiles of exhaust systems for a 99 GT Mustang can vary significantly based on the design and materials used in the system.

• Stock Exhaust: The stock exhaust system offers a moderate sound level, focusing on a balanced tone without excessive noise. It is designed for comfort and emissions compliance, which results in a quiet and subdued exhaust note, appealing to those who prefer a less aggressive sound.
• Cat-Back Exhaust System: A cat-back exhaust system enhances sound by replacing the exhaust components from the catalytic converter back. This system typically produces a deeper and more aggressive tone, often accompanied by a noticeable increase in volume, making it popular among enthusiasts looking for a sportier sound without sacrificing daily drivability.
• Axle-Back Exhaust System: The axle-back system substitutes the rear sections of the exhaust, allowing for a more pronounced sound without altering the front and mid-pipes. This option provides a louder and more aggressive exhaust note while being relatively easy to install, making it a good choice for those who want a quick sound upgrade.
• Long Tube Headers: Installing long tube headers can significantly alter the exhaust sound profile by improving exhaust flow and reducing back pressure. This setup typically results in a louder and more aggressive tone, often favored by those looking for maximum performance and a raw sound that highlights the engine’s capabilities.
• Chambered Mufflers: Chambered mufflers create a distinctive exhaust note characterized by a deep rumble and aggressive bark, particularly at higher RPMs. They utilize internal chambers to resonate sound waves in a way that enhances the Mustang’s sporty character while minimizing drone at cruising speeds.
• Straight Pipe Exhaust: A straight pipe exhaust system eliminates mufflers and resonators entirely, resulting in an extremely loud and aggressive sound profile. While this setup maximizes performance by reducing restrictions, it can be too loud for everyday use and may not comply with local noise regulations.
• Turbo Mufflers: Turbo mufflers provide a unique sound profile that balances performance with a less aggressive tone compared to chambered mufflers. They tend to offer a smooth, deep rumble while reducing drone, making them suitable for those who want a sporty sound without overwhelming noise levels.

What Factors Should Influence Your Decision When Choosing an Exhaust for a 99 GT Mustang?

When choosing the best exhaust for a 99 GT Mustang, several key factors should influence your decision.

• Sound Preference: The sound of the exhaust is a crucial factor, as it defines the character of your vehicle. Some enthusiasts prefer a deep, aggressive growl, while others may want a more subtle tone, so it’s essential to listen to sound clips and consider your personal preference.
• Material Quality: The material of the exhaust system significantly impacts durability and performance. Stainless steel is often favored for its resistance to rust and corrosion, while mild steel may be less expensive but can deteriorate faster, affecting longevity.
• Performance Gains: Different exhaust systems can provide varying levels of performance enhancements. Look for options that improve exhaust flow, as this can lead to increased horsepower and torque, helping your Mustang perform better on the road or track.
• Fitment and Installation: Ensuring that the exhaust system fits correctly on your 99 GT Mustang is vital for ease of installation and optimal performance. Consider whether you want a bolt-on system for straightforward installation or if you’re open to welding and modifications for a custom fit.
• Brand Reputation: The reputation of the manufacturer can greatly influence your choice. Well-known brands often have better quality control, customer support, and warranties, which can provide peace of mind regarding your investment.
• Price Range: Exhaust systems come in a wide range of prices, so it’s important to set a budget. While higher-priced systems may offer better materials and performance, there are also cost-effective options that provide great value without compromising quality.
• Legal Compliance: Some exhaust systems may violate local noise ordinances or emissions regulations. Research your local laws to ensure that the exhaust you choose is street-legal and won’t lead to fines or complications during inspections.
• Appearance: The visual aspect of the exhaust can also be a deciding factor, especially for those looking to enhance their car’s aesthetic. Consider the design of the tips and overall look of the system to ensure it complements the style of your Mustang.

How Can You Successfully Install an Exhaust System on a 99 GT Mustang?

To successfully install an exhaust system on a 99 GT Mustang, it is essential to consider the following key components and steps:

• Choose the Right Exhaust System: Selecting the best 99 GT Mustang exhaust involves understanding different types such as cat-back, axle-back, and header-back systems.
• Gather Necessary Tools: Having the right tools on hand can make the installation process smoother and more efficient.
• Lift the Vehicle: Safely lifting the vehicle is crucial for gaining access to the undercarriage where the exhaust system will be installed.
• Remove the Old Exhaust: Properly detaching the stock exhaust system requires attention to detail to avoid damaging any surrounding components.
• Install the New Exhaust System: Following the manufacturer’s instructions carefully ensures that the new exhaust is fitted correctly and securely.
• Check for Leaks and Test Drive: After installation, performing a thorough check for leaks and taking the vehicle for a test drive is vital to ensure everything is functioning as expected.

Choose the Right Exhaust System: Selecting the best exhaust system for a 99 GT Mustang means considering sound, performance, and fitment. Popular options include cat-back systems that enhance sound and performance without significant modification, while axle-back systems are often simpler and more affordable, focusing on sound enhancement. Header-back systems provide the most extensive upgrade but require more extensive installation work.

Gather Necessary Tools: Essential tools for installing an exhaust system typically include a socket set, wrenches, a cutting tool (if needed), a torque wrench, and safety equipment such as gloves and goggles. Having a jack and jack stands or ramps can also aid in lifting the vehicle securely. Being prepared with the right tools can prevent delays and frustrations during the installation process.

Lift the Vehicle: To access the exhaust system, safely lifting the vehicle is critical. Using a hydraulic jack and jack stands or ramps ensures that the vehicle is stable and secure while you work underneath. Always follow safety protocols to prevent accidents during this phase.

Remove the Old Exhaust: Carefully detaching the stock exhaust requires loosening bolts and clamps that hold it in place. You may need to cut sections of the exhaust depending on the type of system being replaced. Take care to keep track of any hangers or mounting hardware that will be needed for the new exhaust system.

Install the New Exhaust System: Following the installation instructions specific to your chosen exhaust system is crucial for achieving the best fit and performance. Start by positioning the new exhaust components, ensuring they align with existing hangers and mounting points. Tighten all bolts to the manufacturer’s specifications to avoid leaks.

Check for Leaks and Test Drive: Once the new exhaust system is installed, it’s important to check for any exhaust leaks by starting the engine and inspecting joints and connections. Listen for any unusual sounds that could indicate leaks or improper installation. Finally, take the Mustang for a test drive to evaluate performance and sound, ensuring that everything is functioning correctly.

What Maintenance Tips Are Important for Keeping Your 99 GT Mustang Exhaust System in Top Condition?

Maintaining the exhaust system of your 99 GT Mustang is essential for optimal performance and longevity.

• Regular Inspections: Conducting routine checks on your exhaust system can help identify leaks, rust, or damage early on.
• Cleaning the Exhaust Tips: Keeping the exhaust tips clean enhances the appearance and can prevent buildup that may lead to corrosion.
• Check for Rust and Corrosion: The exhaust system is exposed to moisture and heat, which can lead to rust if not monitored.
• Secure Mounting Hardware: Ensuring that all mounting brackets and hangers are tight prevents vibration and misalignment of the exhaust system.
• Replace Worn Components: Regularly replacing parts such as gaskets, clamps, and hangers can prevent leaks and maintain efficiency.
• Monitor Exhaust Sounds: Unusual sounds can indicate issues within the exhaust system, prompting further inspection to identify problems.

Regular inspections should include checking for visible signs of wear or damage, as well as listening for any unusual noises while the engine is running. This proactive approach can save you from larger repairs in the future.

Cleaning the exhaust tips not only makes your Mustang look great but also helps to remove any residue or soot that can build up over time. A simple wipe down with a suitable cleaner can keep the tips shining and functional.

Checking for rust and corrosion is particularly important, as these can compromise the integrity of the exhaust system. If you notice any rust spots, it’s best to address them promptly to avoid more extensive damage.

Secure mounting hardware is crucial for the stability of the exhaust system. Loose hangers can lead to increased vibration, which may cause premature wear or even detachment of parts.

Replacing worn components regularly, such as gaskets or clamps, ensures that the exhaust remains sealed. This not only improves performance but also helps to reduce emissions and noise levels.

Monitoring exhaust sounds is an effective way to catch issues early. A change in sound can indicate a leak or blockage, thus allowing for timely repairs that can prevent further complications.

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