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RX8 Cat Back Exhaust, Manifolds and High-Flow Cats

A complete RX8 cat back exhaust range covering every stage of the system, from manifold to tip. Whether you’re replacing a worn rear section or planning a full exhaust upgrade, each product is listed with fitment details to help you build a cohesive rotary setup.

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GREDDY TRUST Comfort Sports GT Slash Exhaust System for Mazda RX8 (Series 1, 2003-2008)

Stainless cat-back exhaust made in Japan, tuned to 92dB for a genuine sporting note with minimal cabin drone on the daily commute or back-road run.

$1,800

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GP SPORT Exas High-flow Power Catalyser for Mazda RX8 (Series 1 & 2, 2003-2012)

Swap the restrictive factory cat for a freer-flowing performance catalytic converter that retains emissions equipment across the full 2003-2012 RX8 range.

$1,650 inc GST

RX8 titanium tip exhaust displayed loose with polished muffler and blue-tinted tailpipe

HKS Hi-Power Cat-Back Exhaust with Titanium Tip for Mazda RX8 (Series 1 & 2, 2003-2012)

Bolt-on 75mm SUS304 cat-back system with a burnt titanium outlet, freeing rear exhaust flow and giving the Renesis a fuller, crisper rotary note.

$1,900 inc GST

RX8 stainless steel manifold showing polished tubular runners and three mounting flanges

ODULA Stainless Steel Exhaust Manifold for Mazda RX8 (Series 1 & 2, 2003-2012)

Tubular stainless header that sharpens throttle feel, frees the Renesis to rev, and transforms the exhaust note.

$1,400

RX8 cat-back exhaust with two polished mufflers and angled dual tailpipes

AUTOEXE Premium Cat-Back Exhaust Muffler for Mazda RX8 (Series 1 & 2, 2003-2012)

Stainless RX8 cat-back exhaust with a 60.5mm main pipe and oval 110x95mm tip. Sharper response, refined sports tone, no highway drone.

$1,650

APEXi Strengthened Exhaust Hanger Set for Mazda RX8 (Series 1 & 2, 2003-2012)

Fresh Mazda RX8 exhaust hangers, six pieces, steady the system and cure the rattle-and-shift that worn rubber mounts cause.

$120

Close-up of RX8 exhaust surrounds beside tailpipe on red Series 1 bumper

GENUINE MAZDA OEM Exhaust Aluminium Surround Inserts for Mazda RX8 (Series 1, 2003-2008)

Restore the Series 1 rear bumper with genuine Mazda aluminium exhaust surround inserts. Factory-correct fit and finish for a complete OEM result.

$300

Single black RX8 exhaust surrounds trim shown from the outer face on white

GENUINE MAZDA OEM Rear Bumper Exhaust Surround Set for Mazda RX8 (Series 1, 2003-2008)

New genuine Mazda RX8 exhaust surrounds restore the deep black finish around each tailpipe outlet. A matched set keeps both sides consistent.

$200

RX8 rear exhaust surround beneath red bumper beside exhaust tip and rear tyre

GENUINE MAZDA OEM Rear Bumper Exhaust Surround Set for Mazda RX8 (Series 2, 2009-2012)

Renews the black exhaust outlet trim on a Series 2 rear bumper with a factory-correct fit, restoring the clean, matched appearance Mazda intended.

$120

HKS RX8 metal catalyser with polished converter body, heat shield and flanged pipe ends

HKS Metal Catalyzer for Mazda RX8 (Series 1 & 2, 2003-2012)

A 150-cell metallic-core catalytic converter that flows more freely than the factory ceramic unit, sharpening the Renesis exhaust note without decat harshness.

Original price was: $2,600.Current price is: $2,179.

RX8 exhaust earth strap pair laid separately on a white background

ODULA Racing Exhaust Earth Strap Set for Mazda RX8 (Series 1 & 2, 2003-2012)

Grounds the RX8 exhaust system with nickel-plated straps rated to 1400°C, cutting static buildup that interferes with sensors and audio.

$80

What owners are saying

AUTOEXE Sports Steering Wheel (Red Stitch) for Mazda RX8 (Series 2, 2009-2012) AUTOEXE Sports Steering Wheel (Red Stitch) for Mazda RX8 (Series 2, 2009-2012)

I recently installed AutoExe's Sport Steering Wheel on my ND. Taking my time and watching the various video's a few times, it took me a little over an hour, with no real issues, to install the new wheel. I couldn't be much happier with it. The wheel is extremely well made, at least as nice as OEM, with red stitching that matches my SRC paint nicely. It's a tiny bit smaller in diameter than stock, but much thicker, with a mild D shape for additional leg room. For those considering an improved steering wheel, this is a fabulous option in my opinion, particularly if you have red car.

GENUINE MAZDA OEM Intake Solenoid for Mazda RX8 (Series 1 & 2, 2003-2012) GENUINE MAZDA OEM Intake Solenoid for Mazda RX8 (Series 1 & 2, 2003-2012)

Happy 8's day people! For you series 2 owners, here's the easiest way I found to change these little suckers. RX8 Upgrades providing the genuine goods as always. Remove the air box/ CAI, remove throttle body and remove the top part of the UIM only, this will get you easy access to the solenoids. Now you could remove them from this point, but removing the oil filler neck along with the vacuum chamber the solenoids mount to makes it FAR easier to change them. This whole job can be done in an afternoon for a mechanically minded person. On reassemble, don't forget to place the vacuum reference back onto the bottom of the manifold (has a green check valve) otherwise no valve will work. Reassemble and enjoy. PN is KL01-18-741 for those chasing the part

AUTOEXE Premium Cat-Back Exhaust Muffler for Mazda RX8 (Series 1 & 2, 2003-2012) AUTOEXE Premium Cat-Back Exhaust Muffler for Mazda RX8 (Series 1 & 2, 2003-2012)

Just installed my spanking new Autoexe Stainless Muffler, and here's a short take of my initial impressions: The Autoexe catback is lovely - very unique 2 box design and the tips are the tapered kind (ie cut at an angle) each lasercut with the Autoexe logo. Very nicely polished midpipe which connects beautifully (and easily) with the exhaust outlet. Most importantly, the exhaust tips have a perfect visual alignment, unlike other exhausts i've seen where one tip protrudes out more than the other. The Autoexe definitely doesn't have this problem. Also, the 2 box design has a lower profile than stock. Previously, i used to scrape and even dent the exhaust box when clearing humps or even parking - not so with the Autoexe. The Autoexe performs really well, at least on my AT. There is a noticable increase in low end torque, and the car just feels substantially lighter. Revs are much more responsive, and the slight lag felt when launching the car seems to have melted away. Linear acceleration is also much faster (at least across 1st 3 gears), and i'm reaching 120-130kmh much faster on 2nd gear alone (NB mine is the 4spd AT). I'm very pleased with the low-torque gains on the Autoexe - finally i have that slight 'lurch' from start which the manuals seem to have, but the ATs don't. The Autoexe starts off idle with a really low, bassy growl. When first installed, it was barely audible, but sounds louder now. In time, the db will increase to an extent. On higher RPM revs, exhaust sounds deep and wet, and def not those shrilly Remus' we hear on the expressways from time to time. Installation was a breeze, and took under an hour at Monster Garage at Ubi, who's the only authorized dealer in Singapore, so these guys know their stuff. The torque/hp improvement was a shocker esp on low end, esp when mine's an AT. I've heard of bros installing Fujitsubos and HKSs that have either no or negative benefit. In this respect, I'm mighty pleased with the Autoexe. Sound is not loud, but a soft low bassy growl when idle, which develops into a mature wet sound at higher revs.

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.

Frequently Asked Questions

What does 'cat-back' mean on an RX8 exhaust system?

Cat-back refers to the section of exhaust system that runs from the catalytic converter rearward to the tailpipe. On an RX8, replacing this section changes the exhaust note and rear-section flow without disturbing the front pipe, manifold or catalytic converter. It is one of the most accessible ways to refine the sound and character of the car.

Will a cat-back exhaust fit both Series 1 and Series 2 RX8 models?

Not all cat-back systems are interchangeable between Series 1 and Series 2 RX8s. Connection styles and system layouts can differ between the two generations, so it is important to confirm the stated model application on each individual product listing before ordering.

Can I run a cat-back exhaust on its own, or do I need to upgrade the manifold and catalytic converter at the same time?

A cat-back system can be fitted independently of the manifold and catalytic converter, provided the connection at the cat outlet is compatible. Many owners start with the cat-back section and plan manifold or high-flow catalytic converter upgrades as a separate stage. Checking connection details across components before purchasing keeps later upgrades straightforward.

What is the benefit of a high-flow catalytic converter on an RX8?

A high-flow catalytic converter reduces restriction ahead of the cat-back section while retaining the emissions equipment. On a rotary engine that relies on exhaust scavenging, reducing backpressure through the full system rather than just the rear section gives a more consistent result than a cat-back upgrade alone.

Is a 3-inch exhaust the right choice for a street-driven RX8?

A 3-inch system suits builds where the full exhaust path has been opened up to match, but on a standard or mildly modified street RX8 it can produce excessive drone and may not suit daily use. Consider your intended driving environment and the other components already fitted before committing to larger-diameter pipework.

Does an exhaust manifold upgrade make sense before or after a cat-back system?

Either order can work depending on budget and priorities, but many builders fit the cat-back first for the immediate change in sound, then address the manifold as part of a broader front-to-rear system plan. Choosing components with compatible connection points from the start avoids the need to revisit fitment when adding the next stage.

Do I need a tune after fitting a cat-back exhaust on an RX8?

A cat-back replacement on an otherwise standard RX8 does not typically require a retune, as it sits downstream of the oxygen sensors. More comprehensive changes involving the manifold or catalytic converter may warrant a review of the fuelling map, particularly on modified engines.