Do you ship Australia-wide?

Yes, we ship aftermarket exhaust systems Australia-wide. Every order is securely packaged and dispatched within 1–2 business days, excluding weekends and public holidays, with tracked delivery to all metro and regional areas.

How do I choose the right exhaust upgrade?

For a daily driver a cat-back exhaust is usually the best first upgrade. For a turbo vehicle consider a downpipe or turbo-back system. For a tuned build choose an exhaust that matches your airflow and performance goals. For a sound upgrade only, a performance muffler is often all you need.

What is your warranty policy?

All exhaust systems include a standard manufacturer-backed warranty. Manufacturing faults and material defects such as stainless steel issues are typically covered. Fitment problems are assessed against listed vehicle compatibility. Warranty duration varies by manufacturer.

Aftermarket Exhausts

(177 products)

Aftermarket exhausts are one of the most effective upgrades you can make to improve how your car responds under load. At 999 Automotive, we stock a wide range of aftermarket exhaust systems designed to improve airflow, enhance performance, and deliver a deeper, more refined exhaust note without unwanted harshness.

The best aftermarket exhaust systems reduce restriction and allow exhaust gases to flow more efficiently. This supports stronger throttle response, improved power delivery, and a cleaner, more responsive feel when driving—whether on the street or the track.

Why Upgrade Your Car Exhaust System?

Factory exhaust systems are designed to meet noise regulations and manufacturing cost targets. While functional, they are rarely optimised for performance or sound quality.

An aftermarket exhaust system puts performance back at the centre. By improving exhaust flow and reducing back pressure, your engine can breathe more freely, resulting in better output and a sharper driving experience.

A quality aftermarket exhaust system can:

Improve exhaust flow for increased horsepower and torque
Reduce back pressure for better efficiency under load
Enhance throttle response and engine responsiveness
Deliver a deeper, more defined exhaust sound
Offer long-term durability with stainless steel or titanium construction

Aftermarket Exhaust Systems We Stock

Our range includes proven and trusted exhaust brands chosen by enthusiasts who care about performance, fitment, and sound quality. Whether you're upgrading a daily driver or building a dedicated performance vehicle, we stock components to suit every setup.

Cat-Back Exhaust Systems
Cat-back systems replace the exhaust from the catalytic converter to the rear of the vehicle. They’re one of the most popular upgrades for improved sound and response without major engine modifications.
Turbo-Back Exhaust Systems and Downpipes
Turbo-back systems replace the exhaust from the turbo outlet rearwards. Common in turbo builds, they help exhaust gases exit more efficiently, supporting stronger boost response and performance gains.
Performance Mufflers
Performance mufflers modify both exhaust flow and sound. Options range from aggressive, loud tones to more refined systems that maintain comfortable cabin noise levels.
Performance Headers and Extractors
Headers and extractors improve exhaust scavenging, helping naturally aspirated engines expel gases more efficiently for better performance.

If you're looking for an aftermarket exhaust in Australia, 999 Automotive has the parts and expertise to help you choose the right setup. If you’re unsure which exhaust system suits your vehicle or goals, get in touch with our team or visit us in-store for expert advice.