The Pros and Cons of Upgrading Your 4x4’s Exhaust System

Date Posted: 21 May 2024

By its nature, an upgrade can only be beneficial, correct? In most cases, yes, but when it comes to upgrading your 4x4’s exhaust system, there are some drawbacks you should factor in. The drawbacks shouldn’t discourage you from the upgrade, but you should know what they are in order to make an informed decision. So let’s discuss the pros and cons of upgrading your 4x4’s exhaust system and touch on some of the most common upgrades.

Pros of Upgrading Your 4x4's Exhaust System

The benefits of upgrading your 4x4's exhaust system can range from enhanced performance to environmental advantages. Performance systems typically outshine original equipment manufacturer (OEM) exhaust systems in most aspects, including:

1. Improved Horsepower

A primary motivation for many drivers seeking aftermarket exhaust systems is the desire for increased power. These systems facilitate superior airflow, allowing the engine to breathe more freely with each cycle. This optimised air intake translates into a noticeable boost in engine power. Depending on your vehicle's model, exhaust upgrades alone can yield substantial increases in both horsepower and torque.

2. Enhanced Fuel Economy

A close-up image of a black 4x4's exhaust system.

In addition to heightened performance, performance exhaust systems contribute to maintaining optimal air levels within your vehicle's engine. By optimising air circulation, these systems mitigate the engine's need to consume excess fuel to compensate for dirtier air levels. Consequently, you’ll likely see improved fuel economy after installing a high-performance exhaust system. That being said, the increased fuel efficiency may be offset by other modifications you do to your vehicle.

3. Increased Durability

Another advantage of upgrading to a performance exhaust system is increased durability. There are many types of exhausts and aftermarket systems crafted from robust materials such as stainless steel or titanium offer superior longevity compared to factory-installed systems. These materials have exceptional resistance to corrosion, rust, and heat, allowing them to withstand extreme temperatures and harsh weather conditions with ease. As a result, investing in a high-quality aftermarket exhaust system can provide long-term durability and reliability for your 4x4 vehicle, potentially saving you money in the long run.

4. Environmental Benefits

It’s also worth mentioning the environmental benefits associated with upgrading your 4x4's exhaust system. Performance exhausts often incorporate advanced technologies designed to reduce harmful emissions. By promoting more efficient combustion and exhaust gas evacuation, they contribute to a decrease in overall emissions output, making them a greener choice for environmentally-conscious drivers.

What About the Sound and Style?

Many people will upgrade their 4x4’s exhaust system purely for the ability to customise the note of their car and the style. While sound and style are some of the most sought-after features in the aftermarket community, these are relatively subjective, so the upgrades are not universally desirable attributes.

The appeal of a loud exhaust note or visually striking exhaust profile can vary - a throaty exhaust system may be exhilarating on highways or racetracks, but it can be seen as disruptive and intrusive in suburban neighbourhoods. Excessive noise levels may even result in complaints from your neighbours, so this is one factor you should consider before upgrading your exhaust to have a more aggressive note.

Similarly, while the aesthetics of a chrome-imbued exhaust system may be visually appealing, you should consider the trade-offs in terms of durability. Chrome and other visually attractive materials have a shorter shelf-life than steel or titanium, compromising the longevity and performance of the exhaust system. So, when evaluating the visual appeal of a muffler tip or exhaust profile, also factor this in.

Cons of Upgrading Your 4x4's Exhaust System

While there are numerous benefits to upgrading your 4x4's exhaust system, there are also drawbacks that come with these modifications. Some of the main drawbacks you may encounter are:

1. Cost

Cost is the primary con of upgrading a 4x4’s exhaust system. Aftermarket exhaust systems can vary widely in price, ranging from a few hundred dollars for a basic bolt-on system to several thousand dollars for a high-end, custom-made exhaust system. The cost will depend on factors such as the type of system, the materials used, and the make and model of your vehicle.

On top of that, unless you are comfortable installing the system yourself, the installation costs can significantly add to the overall expense, especially if the installation requires additional modifications like cutting or welding to fit the new exhaust system properly.

2. Warranty

You should also factor in that modifying your vehicle's exhaust system can potentially void the factory warranty. Most factory warranties cover a vehicle's components, including the exhaust system, but installing an aftermarket upgrade could void this warranty for the exhaust system and any related components affected by the modification. As a result, you may be responsible for paying out of pocket for any mechanical repairs or replacements that would have been covered otherwise.

3. Fit

An image of the back of a red 4x4 Range Rover.

Not all aftermarket exhaust systems are compatible with every make and model of vehicle. Fitment issues can arise and require additional modifications such as cutting or welding to ensure a proper fit. This can make the installation process more complicated and time-consuming, again increasing the overall cost.

4. Reduced Fuel Economy

Another potential drawback of aftermarket exhaust systems is the impact on fuel economy. Factory exhaust systems are designed to be as efficient as possible, minimising the energy required to expel exhaust gases from the engine. As we mentioned, many aftermarket systems improve fuel economy, however, aftermarket exhaust systems that prioritise performance or sound over fuel efficiency may create more drag, causing the engine to work harder and consume more fuel.

5. Noise and Emission Regulations

Finally, it's essential to consider noise and emission regulations when upgrading your 4x4's exhaust system. Your vehicle must comply with ADR 83/00 regarding the noise levels or you could face fines. Moreover, the Australian Federal Government has announced the implementation of a new, more stringent, gas emission standard starting from 2025.

While this standard should not affect existing cars, it’s worth noting that the regulation regarding emissions is tightening. None of this is to say that aftermarket upgrades can’t be in compliance with the existing noise or emission standards, just that this is another factor to consider when upgrading your 4x4’s exhaust system.

Common Exhaust Upgrades

We’ve discussed the pros and cons of aftermarket upgrades and hope you can use the knowledge as the basis for choosing the best exhaust system upgrade for your 4x4, but let’s also quickly cover some of the most common upgrades.

DPF Back Exhaust: This upgrade replaces the exhaust system from the diesel particulate filter (DPF) to the tailpipe. It enhances exhaust flow and reduces back pressure, improving performance and efficiency while maintaining emissions compliance. Naturally, this upgrade is only applicable if you drive a diesel vehicle.
Turbo Back Exhaust: Replacing the entire exhaust system from the turbocharger to the tailpipe, this upgrade maximises airflow, reduces restriction, and enhances engine performance, particularly in turbocharged vehicles.
High-Flow Catalytic Converters: These catalytic converters increase exhaust flow while still effectively reducing harmful emissions. They offer improved performance and may be necessary for vehicles with aftermarket exhaust systems to maintain emissions compliance.
Performance Mufflers: Upgrading to performance mufflers enhances exhaust flow and alters exhaust sound, often producing a deeper, more aggressive tone. They can improve engine performance while adding a sporty aesthetic to your 4x4.
Exhaust Tips: Primarily cosmetic, exhaust tips can enhance the appearance of the vehicle's exhaust system. They are available in various styles and finishes and add a personalised touch to the vehicle's rear end without significantly impacting performance.

Where Can You Get an Affordable 4x4 Exhaust System Upgrade?

Ready to upgrade your 4x4’s exhaust system? If you are, you can get everything you need at Perform-Ex Auto. Take a look at our range of 4x4 performance exhaust system parts and find the ones you need. We stock aftermarket parts from the world’s leading automotive brands and all of our products come with a genuine warranty.

We have upgrades that fit most vehicle makes and models and provide everything from mufflers to entire system upgrades. Once you make your choice, you can order online, choose from multiple payment options (including buy-now-pay-later), and we will ship the parts right to your address. If you have concerns about the fit or have any other questions, feel free to contact us, we’ll gladly help you out.