345 vs 392 Exhaust: What Are The Differences?

When it comes to upgrading your vehicle’s exhaust system, understanding the differences between various options is crucial.

In this article, we will discuss the key distinctions between 345 and 392 exhaust systems. We will cover aspects such as performance, sound quality, compatibility, and more. This comprehensive guide will provide you with the necessary information to make an informed decision for your next exhaust system upgrade.

The primary difference between 345 and 392 exhaust systems lies in their design, materials, and performance characteristics. Let’s dive deeper into these differences and explore the various factors that set these two systems apart.

Performance Comparison

345 Exhaust System Performance

The 345 exhaust system is designed for vehicles with smaller engines, typically in the 5.7-liter range. This system is optimized for efficient airflow, providing moderate power gains and improved fuel economy.

The exhaust manifold, which is responsible for collecting exhaust gases from the engine, features a smaller diameter tubing, which allows for a quicker exhaust gas velocity, leading to improved engine efficiency and better low-end torque.

392 Exhaust System Performance

The 392 exhaust system, on the other hand, is designed for vehicles with larger engines, generally in the 6.4-liter range. It is built to handle higher exhaust gas flow rates and temperatures, resulting in more significant power gains and improved throttle response.

The 392 exhaust system features larger diameter tubing and a more free-flowing design, which allows for higher exhaust gas velocity and improved high-end horsepower. Additionally, the 392 system often incorporates performance-oriented components such as high-flow catalytic converters and performance mufflers, which further enhance its performance capabilities.

Sound Quality

345 Exhaust System Sound

The 345 exhaust system produces a moderate, deep tone that is suitable for daily driving. It is generally quieter than the 392 system, making it a more practical choice for those looking to maintain a comfortable cabin environment. T

he sound characteristics of the 345 exhaust system are influenced by factors such as the design of the exhaust manifold, the size and shape of the muffler, and the diameter of the exhaust tubing. By utilizing smaller diameter tubing and more restrictive muffler designs, the 345 system is able to keep sound levels in check while still offering improved performance over stock exhaust systems.

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392 Exhaust System Sound

The 392 exhaust system offers a more aggressive, throaty exhaust note. This system is ideal for those seeking a distinctive, performance-oriented sound that sets their vehicle apart from the rest.

The sound produced by the 392 exhaust system is influenced by its larger diameter tubing, less restrictive muffler designs, and the use of performance-oriented components such as high-flow catalytic converters. These factors work together to create a louder, more aggressive exhaust note that is indicative of the system’s performance capabilities.

Installation and Compatibility

Vehicle Compatibility

The 345 and 392 exhaust systems are specifically designed for different engine sizes and vehicle models. Before selecting an exhaust system, consult your vehicle’s owner’s manual or contact the manufacturer to ensure compatibility with your specific make and model.

The compatibility of these systems is determined by factors such as engine size, vehicle layout, and factory exhaust system design.

Installation Process

Both 345 and 392 exhaust systems require professional installation due to their complex designs and unique fitment requirements. It is essential to choose a qualified technician with experience installing the specific exhaust system you have selected to ensure proper installation and optimal performance.

Proper installation involves aligning and securing the exhaust components, ensuring proper clearance from heat-sensitive components, and making any necessary adjustments to the vehicle’s engine management system to accommodate the upgraded exhaust system.

Material and Durability

345 Exhaust System Materials

The 345 exhaust system is typically constructed from stainless steel or aluminized steel. Both materials offer good durability and corrosion resistance, with stainless steel being the more premium option.

Stainless steel exhaust systems often utilize 409 or 304 stainless steel, with 304 stainless steel offering superior corrosion resistance and a higher resistance to heat-induced damage.

392 Exhaust System Materials

The 392 exhaust system is usually made from high-grade stainless steel or titanium. These materials provide superior durability, heat resistance, and weight reduction compared to the materials used in the 345 system.

High-grade stainless steel, such as 304 stainless steel, offers excellent corrosion resistance and heat resistance, while titanium exhaust systems provide the added benefit of reduced weight, which can further improve vehicle performance.

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Emissions and Environmental Impact

345 Exhaust System Emissions

The 345 exhaust system is designed to meet or exceed emissions standards, ensuring compliance with local regulations. It typically offers lower emissions than the 392 system due to its efficient design and smaller engine compatibility.

The use of high-flow catalytic converters and efficient muffler designs helps to reduce harmful exhaust emissions while maintaining the system’s performance gains.

392 Exhaust System Emissions

The 392 exhaust system may produce higher emissions than the 345 system, particularly in high-performance applications. However, many 392 systems still meet or exceed emissions standards and are considered environmentally friendly.

Advanced catalytic converter technology and efficient muffler designs help to minimize the environmental impact of the 392 exhaust system while still providing the desired performance improvements.

Cost Comparison and Lifespan

345 Exhaust System Cost

The 345 exhaust system is generally more affordable than the 392 system, making it an attractive option for those on a budget. Prices can vary depending on materials, brand, and specific features.

The use of aluminized steel or 409 stainless steel can help to reduce the overall cost of the system while still providing satisfactory performance and durability.

392 Exhaust System Cost

The 392 exhaust system is typically more expensive than the 345 system due to its premium materials and performance-oriented design. However, the increased cost can be justified by the significant performance gains and unique sound characteristics it offers.

High-quality stainless steel or titanium materials contribute to the higher price point but also provide increased durability and longevity.


The lifespan of both 345 and 392 exhaust systems depends on factors such as materials, construction quality, and the driving conditions the system is exposed to.

High-quality stainless steel and titanium exhaust systems generally offer a longer lifespan compared to aluminized steel systems, with proper maintenance playing a key role in maximizing the life of the exhaust system.

Top Brands for 345 and 392 Exhaust

Several top brands offer high-quality 345 and 392 exhaust systems, each with their own unique features and designs. Some popular brands to consider include:

  • Borla
  • MagnaFlow
  • Flowmaster
  • Corsa
  • MBRP
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It is essential to research and compare different brands to find the exhaust system that best suits your specific needs, budget, and performance goals.

Maintenance Tips for 345 and 392 Exhaust Systems

Proper maintenance is crucial to ensuring the longevity and performance of your 345 or 392 exhaust system. Here are some maintenance tips to help keep your exhaust system in top condition:

  1. Regularly inspect the exhaust system for signs of corrosion, damage, or leaks. Address any issues promptly to prevent further damage and potential performance loss.
  2. Ensure all exhaust components are securely fastened and check for any loose or broken hangers or mounts.
  3. Keep your vehicle’s engine properly tuned and maintained, as engine issues can negatively impact the performance and lifespan of your exhaust system.
  4. Avoid driving through deep water, as this can cause rapid cooling of hot exhaust components, potentially leading to cracks or other damage. 5. Clean the exhaust tips regularly to remove dirt, grime, and road salt, which can contribute to corrosion and reduced aesthetic appeal.
  5. If you live in an area with harsh winters or where road salt is used, consider applying a protective coating or rust inhibitor to your exhaust system to help combat corrosion.


The choice between a 345 and 392 exhaust system depends on various factors, including engine size, performance goals, sound preferences, budget, and vehicle compatibility. The 345 exhaust system is generally more suitable for daily driving and offers moderate performance gains, while the 392 system provides more significant power gains and a more aggressive exhaust note for those seeking a performance-oriented upgrade.

By considering factors such as materials, emissions, and top brands, you can make an informed decision that best suits your specific needs and preferences. Regardless of your choice, proper maintenance and professional installation are crucial to ensuring the longevity and performance of your new exhaust system.