When it comes to upgrading your car’s exhaust, a catback exhaust system is one of the best modifications you can make. It improves your vehicle’s sound, increases airflow, and can even boost performance—all without touching your engine.
But what exactly is a catback exhaust, how does it work, and why should you consider one for your ride? Let’s break it down.
What Is a Catback Exhaust?
A catback exhaust is an aftermarket exhaust system that replaces everything from the catalytic converter (or "cat") to the back of the car. This typically includes:
-
Mid-pipe – Connects the catalytic converter to the rest of the exhaust.
-
Resonator (optional) – Helps shape the exhaust sound.
-
Muffler – Controls the volume and tone of the exhaust.
-
Tailpipes or Exhaust Tips – The final exit point for exhaust gases.
Is a Catback Exhaust Legal?
Because a catback system doesn’t touch the catalytic converter, it remains street-legal in most states, making it one of the easiest ways to get a more aggressive sound and better performance without breaking emissions laws. As sound results may vary depending on your kit, you’ll also want to make sure you do not exceed noise levels in your state.
Recommended Reading: Make Your Exhaust Louder: 9+ Budget-Friendly Mods
How Does a Catback Exhaust Work?
A factory exhaust system is designed to be quiet and restrictive, keeping engine noise down and prioritising comfort over performance. A catback exhaust, on the other hand, increases airflow, allowing exhaust gases to exit faster and more efficiently.
Here’s what happens when you install a catback system:
-
Reduced Back Pressure – The larger, smoother pipes allow gases to flow out more easily, reducing engine strain.
-
Improved Engine Efficiency – Less restriction means the engine doesn’t have to work as hard, which can improve throttle response.
-
Better Exhaust Sound – Depending on the design, a catback can give you anything from a deep, refined growl to an aggressive, race-inspired roar.
Recommended Reading: Cat Back Exhaust Vs. Turbo Back Exhausts: What's the Difference?
4 Benefits of a Catback Exhaust
Upgrading to a catback system offers several advantages, making it a top choice for auto enthusiasts.
-
More Aggressive Exhaust Sound
One of the main reasons people install a catback exhaust is for better sound. Whether you want a subtle growl or a full-on roar, a catback system can transform how your car sounds.
✔ Deeper, sportier tone
✔ Louder than stock, but not overwhelming
✔ Customisable with different mufflers and resonators
Pro Tip: The sound you pull from your exhaust will depend on the materials, muffler type, and pipe design. Straight-through mufflers give a louder, raspier sound, while chambered mufflers provide a deeper growl.
-
Improved Performance & Horsepower
A well-designed catback exhaust reduces exhaust restriction, helping the engine breathe better. While it won’t add massive power, it can provide a small increase in horsepower and torque, especially when combined with other performance mods.
✔ Better throttle response
✔ Increased power (typically 5-15 HP on naturally aspirated engines, possibly more on turbocharged vehicles)
✔ Supports other mods like intake upgrades and ECU tuning
Pro Tip: To maximise power gains, pair a catback exhaust with a cold air intake and a performance tune.
-
Better Fuel Efficiency
Because a catback system improves airflow, the engine doesn’t have to work as hard to push out exhaust gases. This can lead to a slight improvement in fuel economy, especially on highway drives.
✔ More efficient exhaust flow
✔ Less engine strain = better fuel consumption
✔ Ideal for daily drivers and weekend warriors
Pro Tip: Don’t expect massive fuel savings, but even a small improvement means fewer trips to the petrol station.
-
Lighter Weight & Better Materials
Aftermarket catback exhausts are often made from stainless steel, titanium, or aluminised steel, making them more durable and lighter than stock systems.
✔ Less weight = better performance
✔ Corrosion-resistant materials for a longer lifespan
✔ More stylish exhaust tips than stock standard ones
Pro Tip: If you want the best durability, go for stainless or aluminised steel for ultra-lightweight performance.
Types of Catback Exhaust Systems
When looking at systems online, you’ll find that product names can get quite long and options for customisation run deep. The type you choose will affect sound, performance, and looks. What are some things you should consider?
Single Exit vs. Dual Exit
-
Single exits consist of one pipe and tend to be lighter, straightforward builds.
-
Dual exits split off into two exhaust pipes and tend to have a sportier finish on the exhaust tips.
Muffler Types
-
Glasspack mufflers allow exhaust gases to travel ‘straight through’ with minimal restriction to create maximum, roaring sound.
-
Chambered types use internal walls and baffles to dampen noise, while still delivering deep, aggressive notes.
-
Straight-through versions combined the best of both worlds to deliver a refined exhaust note while also optimising engine performance.
Pipe Material
-
Mild steel – Budget-friendly but prone to rust.
-
Aluminised steel – More durable than mild steel.
-
Stainless steel – Lightweight, corrosion-resistant, best for longevity.
-
Titanium – Ultra-lightweight and durable (but very pricey).
Recommended Reading: Top 6 Reasons to Upgrade Your Performance Exhaust System
FAQs
1. Will a catback exhaust increase horsepower?
Yes, but the gains are usually moderate (5-15 HP). If combined with a tune and intake, the benefits are more noticeable.
2. Is a catback exhaust legal?
Yes, since it doesn’t remove the catalytic converter, most catback systems are legal. However, always check local noise regulations.
3. How much does a catback exhaust cost?
Prices range from $500 to $2,500, depending on brand, material, and design.
4. Is a catback exhaust loud?
It depends on the design of the system. A catback exhaust is generally louder than a stock exhaust because it reduces restrictions and allows for better airflow. However, the level of loudness varies based on factors like vehicle type, muffler type, pipe diameter, resonators, and more.
If you want an aggressive roar, opt for a high-performance catback with a straight-through muffler. If you prefer a deeper but street-friendly tone, a system with a resonator and chambered muffler may be a better choice.
Is a Catback Exhaust Right for You?
Catback systems are an excellent choice for those seeking a balance of performance improvement and sound enhancement without altering their emissions system illegally.
Ready to upgrade? At DEA Performance, we have Australia’s largest range of exhausts, stocking all the parts you need to totally transform your vehicle’s performance. Check out our current catback deals, and if you need any parts guidance or assistance, our team of auto experts can help you build the perfect setup for your ride.
