RX8 Cat Back Exhaust, Manifolds and High-Flow Cats

An RX8 cat back exhaust covers everything behind the catalytic converter: mid-pipe, resonator, rear silencer and tip. This range extends further, covering manifolds and high-flow cats for owners sharpening the sound, flow and configuration of their rotary build at every stage of the system.

The 13B-MSP’s combustion cycle produces exhaust pulses at a different rhythm to a piston engine. Because of this, the system’s design, diameter and flow characteristics genuinely influence how the car breathes and sounds across the rev range. Choosing the right rear section changes the character of the car without touching the front of the system. It is, therefore, one of the most accessible upgrades in a performance exhaust build.

Building Your RX8 Exhaust System from the Ground Up

A rear section is rarely the whole story. For a more complete setup, an RX8 exhaust manifold upgrade addresses the primary collection point directly off the rotor housings. That is where the gains from improved flow begin. In addition, pairing it with an RX8 high flow catalytic converter and a well-matched cat-back section gives you a system working together from engine-out to tailpipe. This approach is especially worthwhile if the stock exhaust is original and ageing. For example, worn sections rob flow and degrade sound before the obvious signs of failure appear.

Pipe diameter is also worth considering at every stage. A 3 inch RX8 exhaust mid-section or cat-back suits builds chasing a freer-revving character and a more assertive note at higher revs. Meanwhile, a slightly smaller diameter may preserve mid-range response on a lightly modified road car. The right choice depends on what else is fitted and how the car is used. Always read the individual product descriptions for the manufacturer’s stated intent.

Series 1 and Series 2 Fitment

Exhaust fitment across the RX8 range is not always interchangeable. For example, connection diameters, mid-pipe routing and rear bumper clearances can differ between early and later models. Some products are specifically engineered for the RX8 Series 2 facelift; others suit the Series 1 body.

Every listing on this page states its intended fitment. Therefore, confirm your car’s series and production year match the product’s application before ordering. If you’re unsure which series you own, the easiest reference is Mazda’s RX8 information page.

Choosing the Right RX8 Cat Back Exhaust Parts

• Cat-back systems and rear sections suit owners updating exhaust note and rear-section condition without disturbing the front half of the system.
• Exhaust manifolds are, however, the logical upgrade for builds planned from the engine outward. They improve primary flow before a cat or mid-pipe is selected.
• High-flow catalytic converters bridge the manifold and cat-back sections. They also retain emissions equipment while reducing the restriction of the standard unit.
• Pipe diameter affects both flow and tone. Therefore, confirm the stated diameter suits your existing or planned components before ordering.
• Brand and construction are moreover worth comparing: mandrel-bent stainless tubing, weld quality and flange spec are visible indicators of how a system will perform and last in Australian conditions.

Browse the listings below and read the fitment notes carefully. Build your shortlist around the exhaust sections your car actually needs. Finally, whether you’re starting with a single rear section or speccing a full RX8 cat back exhaust alongside a manifold and high-flow cat, focus on the stated diameter, connection style and intended application. The right fit for your specific build and budget matters more than a label.