Hey guys! Let's dive into the world of upgrading the exhaust system on a 1990 Honda Civic Sedan. Whether you're looking for better performance, a sportier sound, or just need to replace a rusty old exhaust, this guide will cover everything you need to know. We'll explore different types of exhaust systems, factors to consider when choosing one, and give you a step-by-step overview of the installation process. So, grab your tools and let's get started!

Why Upgrade Your 1990 Honda Civic Sedan's Exhaust System?

Upgrading your 1990 Honda Civic Sedan's exhaust system can bring a range of benefits that go beyond just making your car sound cooler. Let's break down the key reasons why you might consider this upgrade:

• Improved Performance: The stock exhaust system on a 1990 Civic is designed for efficiency and noise reduction, which often means it's restrictive. An aftermarket exhaust system, especially one with larger diameter piping and a less restrictive muffler, can significantly improve exhaust flow. This reduces backpressure on the engine, allowing it to breathe easier and produce more horsepower and torque. Think of it like this: it's easier to exhale through a wide-open pipe than a tiny straw. When your engine can expel exhaust gases more efficiently, it can take in more air and fuel, leading to a noticeable boost in performance. For a car like the 1990 Civic, even a modest increase in power can make a significant difference in how it feels on the road.
• Enhanced Sound: Let's be honest; one of the most appealing reasons to upgrade your exhaust is the sound. A new exhaust system can give your Civic a deeper, more aggressive tone that turns heads and makes driving more enjoyable. Whether you prefer a subtle rumble or a roaring growl, there's an exhaust system out there that will deliver the sound you're looking for. Different mufflers and resonators play a crucial role in shaping the exhaust note. A chambered muffler, for instance, tends to produce a deeper, more classic sound, while a straight-through muffler will give you a louder, more aggressive tone. Keep in mind that sound is subjective, and what sounds great to one person might be annoying to another. Always consider your personal preferences and local noise regulations when choosing an exhaust system.
• Better Fuel Efficiency: While performance and sound are the primary motivators for many, an upgraded exhaust can also contribute to improved fuel efficiency. By reducing backpressure, the engine doesn't have to work as hard to expel exhaust gases, which can lead to a slight improvement in gas mileage. The gains might not be dramatic, but over time, they can add up. This is especially true if you combine the exhaust upgrade with other performance-enhancing modifications, such as an aftermarket air intake or a performance chip. These modifications work together to optimize the engine's overall efficiency, resulting in a noticeable improvement in fuel economy. It's important to note that aggressive driving habits can negate any potential fuel efficiency gains, so drive responsibly to maximize the benefits.
• Aesthetic Appeal: A shiny new exhaust system can add a touch of style to your Civic's rear end. Many aftermarket exhaust systems feature polished stainless steel tips that look much better than the stock exhaust. This can be a simple way to freshen up the look of your car and make it stand out from the crowd. The exhaust tip is often the only part of the exhaust system that's visible, so choosing a tip that complements your car's overall style is essential. You can find exhaust tips in various shapes, sizes, and finishes, from classic round tips to more modern angled or oval designs. Consider the overall aesthetic you're trying to achieve and choose an exhaust tip that fits the theme. Beyond the tip, a complete exhaust system can also improve the visual appeal of the undercarriage, especially if your old exhaust was rusty and corroded.

Types of Exhaust Systems for Your 1990 Honda Civic Sedan

Alright, let's break down the different types of exhaust systems you can get for your 1990 Honda Civic Sedan. Knowing the differences will help you make the best choice for your needs and budget.

• Axle-Back Exhaust Systems: An axle-back system replaces everything from the rear axle to the exhaust tip. This is usually the most budget-friendly option and is relatively easy to install since it only involves removing and replacing a few components. Axle-back systems primarily affect the sound of your exhaust, giving you a more aggressive tone without significantly altering performance. These systems typically include a new muffler and exhaust tip and can be installed with basic hand tools in your garage. While axle-back systems offer a noticeable improvement in sound, they don't provide the same performance gains as cat-back or full exhaust systems. If you're primarily concerned with enhancing the sound of your Civic and want a simple, affordable upgrade, an axle-back system is an excellent choice. It's also a great option for beginners who are new to car modifications and want to start with a straightforward project.
• Cat-Back Exhaust Systems: A cat-back system replaces everything from the catalytic converter to the exhaust tip. This includes the mid-pipe, muffler, and exhaust tip. Cat-back systems offer a better balance of performance and sound compared to axle-back systems. The larger diameter piping and less restrictive muffler improve exhaust flow, resulting in a noticeable increase in horsepower and torque. Installation is a bit more involved than an axle-back system, but it's still manageable for most DIYers with basic mechanical skills. Cat-back systems are a popular choice for enthusiasts who want to improve their Civic's performance and sound without breaking the bank. They offer a significant upgrade over the stock exhaust system and provide a satisfying driving experience. When choosing a cat-back system, consider the material it's made from. Stainless steel systems are more durable and resistant to rust and corrosion than aluminized steel systems.
• Full Exhaust Systems (Headers-Back): A full exhaust system, also known as a headers-back system, replaces the entire exhaust system from the exhaust manifold (headers) to the exhaust tip. This is the most comprehensive and performance-oriented option. Replacing the restrictive stock headers with aftermarket headers significantly improves exhaust flow, resulting in substantial gains in horsepower and torque. Full exhaust systems also offer the most aggressive sound. However, they are the most expensive and require the most effort to install. Installing headers can be challenging, especially on older cars like the 1990 Civic, where bolts may be rusted or seized. Full exhaust systems are best suited for experienced DIYers or professional installers. If you're serious about maximizing your Civic's performance and don't mind spending the extra money and effort, a full exhaust system is the way to go. Keep in mind that some full exhaust systems may not be street legal in certain areas, so check your local regulations before making a purchase.

Factors to Consider When Choosing an Exhaust System

Choosing the right exhaust system for your 1990 Honda Civic Sedan involves more than just picking the loudest or most expensive one. Here are some key factors to keep in mind:

• Material: Exhaust systems are typically made from either aluminized steel or stainless steel. Aluminized steel is more affordable but is more prone to rust and corrosion, especially in areas with harsh weather conditions. Stainless steel is more expensive but offers superior durability and resistance to rust. If you live in an area with snow, salt, or frequent rain, stainless steel is the better choice. While the initial cost is higher, it will save you money in the long run by preventing the need for premature replacement. Stainless steel also looks better for longer, maintaining its shine and appearance even after years of use.
• Piping Diameter: The diameter of the exhaust piping affects exhaust flow and, consequently, performance. Larger diameter piping generally improves exhaust flow, but going too large can actually hurt performance by reducing exhaust velocity. For a 1990 Civic with a stock or mildly modified engine, a 2-inch to 2.25-inch diameter exhaust is usually optimal. If you have a heavily modified engine with forced induction or high compression, you might consider a 2.5-inch or larger exhaust. It's essential to strike a balance between exhaust flow and velocity to maximize performance across the entire RPM range. Consult with a performance shop or experienced Civic enthusiast to determine the ideal piping diameter for your specific setup.
• Muffler Type: The muffler plays a crucial role in determining the sound of your exhaust. Different muffler designs produce different sound characteristics. Chambered mufflers tend to produce a deeper, more classic sound, while straight-through mufflers offer a louder, more aggressive tone. Turbo mufflers are designed to reduce turbo lag and provide a smoother exhaust flow. The best muffler for you will depend on your personal preferences and local noise regulations. Listen to sound clips of different mufflers before making a decision to get a better idea of what they sound like in real life. You can find numerous sound clips on YouTube and other online forums.
• Sound Level: Consider the sound level of the exhaust system. Some exhaust systems are very loud and may not be suitable for daily driving or residential areas. Check your local noise regulations before purchasing an exhaust system to ensure it complies with the law. You can also look for exhaust systems with adjustable sound levels or resonators to help reduce noise. It's essential to be considerate of your neighbors and other drivers when choosing an exhaust system. A loud exhaust can be fun, but it's not worth getting a ticket or causing a nuisance.
• Fitment and Compatibility: Ensure the exhaust system is specifically designed for your 1990 Honda Civic Sedan. While some exhaust systems may be universal, they often require modifications to fit properly. Check the manufacturer's website or online forums to confirm compatibility before making a purchase. A properly fitting exhaust system will be easier to install and will ensure optimal performance. It will also prevent exhaust leaks and other issues that can arise from improper fitment. Pay attention to the mounting points and hangers to ensure they align correctly with your Civic's chassis.
• Price: Exhaust systems can range in price from a few hundred dollars to over a thousand dollars. Set a budget before you start shopping and stick to it. Consider the long-term value of the exhaust system and choose one that offers the best combination of performance, durability, and price. Don't be afraid to shop around and compare prices from different vendors. Look for sales and discounts to save money on your purchase.

Step-by-Step Installation Guide

Disclaimer: Working on your car can be dangerous. If you're not comfortable with these steps, please seek professional help.

1. Gather Your Tools: You'll need a socket set, wrench set, penetrating oil, jack stands, a jack, and possibly an exhaust hanger removal tool.
2. Prepare the Car: Jack up your 1990 Honda Civic Sedan and secure it with jack stands. Safety first, guys! Make sure the car is stable before you start working.
3. Loosen the Bolts: Spray penetrating oil on all the bolts and connections of the old exhaust system. Let it soak for a while to make removal easier.
4. Remove the Old Exhaust: Start by unbolting the exhaust system at the catalytic converter (or headers, if you're doing a full system). Then, remove the hangers that hold the exhaust in place.
5. Install the New Exhaust: Install the new exhaust system in the reverse order of removal. Make sure all the bolts are tightened to the manufacturer's specifications.
6. Check for Leaks: Start the car and listen for any exhaust leaks. If you hear any leaks, tighten the bolts further or replace the gaskets.

Final Thoughts

Upgrading the exhaust on your 1990 Honda Civic Sedan can be a rewarding experience. You'll get better performance, a cooler sound, and maybe even a little extra fuel efficiency. Just remember to do your research, choose the right system for your needs, and follow the installation instructions carefully. Now, go out there and make your Civic sound awesome!