Hey there, Honda enthusiasts! Are you looking to boost the performance, sound, or overall look of your 1999 Honda Civic? One of the most effective ways to achieve this is by upgrading your exhaust system. In this comprehensive guide, we'll dive deep into everything you need to know about the 1999 Honda Civic exhaust system, from understanding its components to choosing the right upgrade. Whether you're a seasoned mechanic or a DIY newbie, this article is packed with valuable insights to help you make the best decision for your ride.

Understanding the Stock Exhaust System

Before you start dreaming about that sweet, throaty roar, it's crucial to understand what you're working with. The stock exhaust system on a 1999 Honda Civic is designed primarily for efficiency and emissions control. It's a system built for everyday driving, focusing on minimizing noise and maximizing fuel economy. Let's break down the key components:

• Exhaust Manifold: This is where the exhaust gases first exit the engine. The manifold collects these gases from each cylinder and directs them into a single pipe. Stock manifolds are typically made of cast iron, which is durable but not the most efficient in terms of flow.
• Catalytic Converter: A crucial component for reducing harmful emissions, the catalytic converter uses chemical reactions to convert pollutants like hydrocarbons, carbon monoxide, and nitrogen oxides into less harmful substances. While essential for environmental reasons, it can also restrict exhaust flow.
• Resonator: The resonator helps to reduce noise levels by canceling out certain frequencies in the exhaust stream. It's essentially a sound dampener that contributes to a quieter ride.
• Muffler: The final stage in the exhaust system, the muffler is designed to further reduce noise. It uses a series of chambers and baffles to attenuate sound waves before the exhaust exits the tailpipe.
• Piping: Connecting all these components are various pipes, usually made of steel. The diameter and bends in these pipes can also affect exhaust flow and overall performance.

Why Upgrade? The stock exhaust system, while functional, often leaves performance enthusiasts wanting more. Upgrading can lead to several benefits, including increased horsepower, improved fuel economy (in some cases), a more aggressive exhaust note, and a sportier look. However, it's important to choose the right components to achieve your desired results without negatively impacting emissions or creating excessive noise.

Choosing the Right Exhaust System

Alright, so you're ready to upgrade. Awesome! But where do you start? With so many options available, selecting the right exhaust system for your 1999 Honda Civic can feel overwhelming. Let's break down the different types of exhaust systems and components to help you make an informed decision.

Cat-Back Systems

A cat-back exhaust system replaces everything from the catalytic converter back to the tailpipe. This is a popular choice for many Civic owners because it offers a good balance of performance gains, sound improvement, and ease of installation. Cat-back systems typically include a new resonator, muffler, and piping, all designed to improve exhaust flow and reduce backpressure. They often feature larger diameter piping and less restrictive mufflers, which can result in a noticeable increase in horsepower and a more aggressive exhaust note. When selecting a cat-back system, consider the following:

• Material: Stainless steel is a popular choice for its durability and resistance to corrosion. Aluminized steel is a more affordable option but may not last as long in harsh climates.
• Piping Diameter: A larger diameter pipe generally allows for better exhaust flow, but going too large can actually decrease performance by reducing exhaust velocity. A 2.25-inch or 2.5-inch diameter is usually a good choice for a modified Civic.
• Muffler Design: Different muffler designs will produce different sound characteristics. Chambered mufflers tend to be louder and more aggressive, while straight-through mufflers offer a smoother, more refined sound.
• Brand Reputation: Stick with reputable brands known for quality and performance. Reading reviews and doing your research can help you avoid disappointment.

Axle-Back Systems

An axle-back system is a more budget-friendly option that replaces only the muffler and the section of pipe from the rear axle to the tailpipe. While it won't offer as significant performance gains as a cat-back system, it can still provide a noticeable improvement in sound and appearance. Axle-back systems are relatively easy to install and are a great way to add some flair to your Civic without breaking the bank. Keep in mind that the catalytic converter and resonator are not changed, which would limit performance enhancements.

Headers

For those looking to maximize performance, upgrading the exhaust header is a must. The header replaces the stock exhaust manifold and is designed to improve exhaust flow right from the engine. Aftermarket headers typically feature smoother bends and larger diameter tubing, which can significantly reduce backpressure and increase horsepower. There are two main types of headers:

• Shorty Headers: These headers are designed to be a direct replacement for the stock manifold and are relatively easy to install. While they offer some performance gains, they are not as effective as long tube headers.
• Long Tube Headers: Long tube headers feature longer primary tubes that are designed to optimize exhaust flow and maximize horsepower. They typically require more extensive modifications to install, but the performance benefits can be significant. When choosing headers, make sure they are compatible with your Civic's engine and emissions requirements. Some headers may require modifications to the catalytic converter or may not be legal for street use in certain areas.

Catalytic Converters

If your stock catalytic converter is old or damaged, or if you're simply looking to improve exhaust flow, upgrading to a high-flow catalytic converter is a good option. High-flow cats are designed to reduce backpressure while still meeting emissions standards. They feature a less restrictive internal design that allows exhaust gases to flow more freely. However, it's important to choose a catalytic converter that is legal for street use in your area. Some aftermarket catalytic converters may not meet emissions requirements and could result in fines or failed inspections.

Installation Tips and Considerations

So, you've chosen your new exhaust system – congrats! Now comes the fun part: installation. Whether you're tackling the job yourself or hiring a professional, here are some tips and considerations to keep in mind:

• Safety First: Always disconnect the battery before working on the exhaust system. Exhaust components can get extremely hot, so make sure the system is cool before you start. Wear safety glasses and gloves to protect yourself from burns and debris.
• Tools: Make sure you have all the necessary tools before you begin. This may include a socket set, wrench set, penetrating oil, a jack and jack stands, and a hacksaw or exhaust cutter.
• Penetrating Oil: Spray penetrating oil on all the bolts and connections before you attempt to remove them. This will help to loosen stubborn bolts and prevent them from breaking.
• O2 Sensors: Be careful when removing and reinstalling oxygen (O2) sensors. They can be fragile, and damaging them can cause your engine to run poorly.
• Exhaust Hangers: Use new exhaust hangers to ensure that your new system is properly supported. Old hangers can be worn or broken, which can cause the exhaust system to rattle or sag.
• Leaks: After installing the new system, start the engine and check for exhaust leaks. Leaks can reduce performance and cause the engine to run lean. Tighten all connections and use exhaust sealant if necessary.
• Professional Installation: If you're not comfortable working on your car, consider hiring a professional to install the exhaust system. A qualified mechanic can ensure that the system is installed correctly and safely.

Sound and Performance Expectations

Before you fire up your Civic with its new exhaust, let's talk about what to expect in terms of sound and performance. The sound of your exhaust system will depend on the type of components you choose and the overall design. Generally, aftermarket exhaust systems will be louder and more aggressive than the stock system. Cat-back systems tend to produce a deeper, more resonant tone, while axle-back systems may be slightly louder than stock. Headers can also significantly affect the sound, with long tube headers typically producing a higher-pitched, more raspy exhaust note.

In terms of performance, you can expect to see a noticeable increase in horsepower and torque with a well-designed exhaust system. The exact amount of gain will depend on the specific components you choose and the other modifications you've made to your engine. However, even a mild cat-back system can add a few horsepower and improve throttle response. Remember that the goal is to optimize exhaust flow without creating excessive backpressure. A balanced system that is properly matched to your engine will deliver the best results.

Conclusion

Upgrading the exhaust system on your 1999 Honda Civic is a great way to improve its performance, sound, and appearance. By understanding the different components of the exhaust system and choosing the right upgrades for your needs, you can transform your Civic into a true performance machine. Whether you're looking for a mild sound improvement or a significant horsepower boost, there's an exhaust system out there that's perfect for you. So, go ahead and start exploring your options – your Civic will thank you for it!