Select Your Vehicle
Search

Cat Back Exhausts

(47 products)

Few upgrades change the character of a performance car as immediately as a cat back exhaust. From the first ignition, the engine sounds more purposeful, the throttle feels sharper, and the entire driving experience becomes more engaging.

At 999 Automotive, our cat back exhausts are carefully selected for performance, durability, and precise vehicle fitment. Engineered to suit modern performance builds and Australian driving conditions, these systems can complement ECU tunes, intake upgrades, and other performance modifications.

Why Upgrade to a Cat Back Exhaust?

Factory exhausts are designed for cost, noise limits, and emissions compliance, which works for everyday driving but can hold back a high-performance engine. A quality cat back exhaust changes that, improving flow, trimming weight, and giving the car a more purposeful tone. The result is smoother power delivery, potential gains in horsepower and torque, and an exhaust note that feels engineered rather than forced.

For vehicles already running ECU tunes or other performance upgrades, a free-flowing exhaust becomes even more impactful. Brands like Integrated Engineering, Unitronic, and JDY Performance pair hardware and software upgrades to unlock the full potential of modern engines.

Cat-Back vs Axle-Back vs Turbo-Back

Understanding the differences between exhaust configurations can help you choose the right upgrade.

  • A cat-back exhaust system replaces everything after the catalytic converter. It improves both sound and performance without interfering with emissions equipment.
  • An axle-back exhaust only replaces the rear muffler section. It primarily changes the sound profile but offers minimal performance gains.
  • A turbo-back system replaces the entire exhaust from the turbocharger outlet to the tailpipes. While this offers maximum performance potential, it’s typically a more complex modification.

    • For many enthusiasts, cat-back systems provide the ideal middle ground between performance, sound quality, and installation simplicity.

    Performance Exhausts Built for Australian Roads

    When selecting a cat back exhaust, quality and fitment matter. Precision-built systems equal proper alignment, optimal airflow, and long-term durability. Premium materials such as stainless steel construction also help resist corrosion and withstand Australia’s diverse climate conditions.

    Explore the full range of performance upgrades in our range of exhausts to find systems designed for specific vehicle platforms.

    And if you want expert advice on compatibility with your vehicle, the team at 999 Automotive can help guide your decision. Contact us to speak with a performance specialist.

View as

FAQs

A cat back exhaust system replaces the section of exhaust piping that runs from the catalytic converter to the rear of the vehicle. This typically includes the mid-pipe, resonators, mufflers, and exhaust tips. By improving airflow compared with factory systems, cat back exhausts can improve both performance and sound.

What is a cat-back exhaust system?

A cat back exhaust system replaces the section of exhaust piping that runs from the catalytic converter to the rear of the vehicle. This typically includes the mid-pipe, resonators, mufflers, and exhaust tips. By improving airflow compared with factory systems, cat back exhausts can improve both performance and sound.

What does a cat-back exhaust improve?

A cat back exhaust improves exhaust flow, allowing the engine to expel gases more efficiently. This can enhance power delivery, exhaust tone, and performance gains depending on the vehicle and supporting modifications.

Is a cat-back exhaust legal in Australia?

Most cat back exhaust upgrades are legal because they retain the catalytic converter and emissions equipment. However, the system must still meet local noise regulations and be suitable for road use.

Will installing a cat-back exhaust affect fuel efficiency?

In some cases, improved exhaust flow can lead to slightly better fuel efficiency during steady driving. However, the difference is usually modest and depends heavily on driving style.

Compare /8