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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.

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

Reviews from around the web

Independent reviews of this product gathered from other stores and owner communities.

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.

$1,650

This RX8 cat-back exhaust replaces the standard rear silencer with a large-capacity, straight-through stainless steel unit. The Renesis responds more eagerly across the practical rev range.

The rotary soundtrack takes on a composed sports character without becoming intrusive at cruise. It fits all Series 1 and Series 2 models built from 2003 to 2012.

AUTOEXE engineered the system around a 60.5mm main pipe diameter. That diameter is carefully tuned alongside the internal silencer structure to balance flow and cabin refinement. The oval 110x95mm tail end sits cleanly beneath the bumper. It has a mature, purposeful look that suits the RX8’s lines without shouting.

AUTOEXE RX8 Cat-Back Exhaust Key Features

  • Stainless steel construction throughout, built to resist the heat cycles and moisture exposure that shorten the life of cheaper systems.
  • The 60.5mm main pipe diameter is deliberately tuned, not simply maximised. It sharpens accelerator response from everyday speeds where the Renesis is actually driven.
  • A large-capacity straight-structure silencer handles noise reduction without creating the back-pressure typical of a restrictive OEM unit.
  • The 110x95mm oval tail tip has a sophisticated, understated finish. It complements an AUTOEXE-themed build or a clean factory look equally well.
  • Finally, this cat-back system is a safety-standard compliant product, making it a practical choice for owners who need to keep their car registered and roadworthy.

For RX8 enthusiasts, the character of this system is its best quality. The note builds with commitment through the rev range, gaining genuine presence as the Renesis climbs toward the redline.

It stays restrained enough on a long highway run that nothing about the daily commute feels like a compromise. That balance is what separates a well-engineered exhaust from a louder, blunter alternative.

Upstream, the GP SPORT Exas High-flow Power Catalyser frees the mid-section so this RX8 cat-back exhaust can work as intended from the catalytic converter back. For a more aggressive titanium-tipped alternative, the HKS Hi-Power Cat-Back Exhaust with Titanium Tip is the natural comparison. The AUTOEXE Intake Suction Kit is a logical companion on the induction side, completing the breathing improvements at both ends of the engine. Explore the full AUTOEXE exhaust range at the AUTOEXE official website.

Reviews from around the web

Independent reviews of this product gathered from other stores and owner communities.

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.

Additional information

RX8 Model

,

Colour

SKU AE-EXH-S1S2 Category Types , Brand:

Related RX8 Upgrades

This cat-back exhaust muffler is one of the best Mazda RX-8 upgrades you can make to your Series 1 (2003-2008) or Series 2 (2009-2012). Exhaust muffler upgrades are among the top Aftermarket mods you can buy from AUTOEXE for owners who want better performance and reliability from their RX8. If you are looking for catback exhaust mufflers for sale in Brisbane (QLD), Sydney (NSW), Melbourne (VIC), Canberra (ACT), Adelaide (SA), Darwin (NT) or Perth (WA), you’ll find high-quality Japanese Exhaust upgrades at RX8 Upgrades.

Frequently Asked Questions

Does this AUTOEXE cat-back exhaust fit both Series 1 and Series 2 RX8 models?

Yes, the AUTOEXE cat-back exhaust suits all Mazda RX8 models across the full production run, covering Series 1 (2003-2008) and Series 2 (2009-2012). No modification is required for either generation.

Will this exhaust drone on the highway during daily driving?

Store owner Josh has fitted this system to multiple RX8s and specifically notes the absence of the persistent drone common in cheaper cat-back systems on long highway runs. The tone stays refined at cruise and only grows noticeably aggressive as the revs climb.

How does this cat-back exhaust change the sound of the Renesis?

The tone builds progressively with RPM rather than being loud at all times. At cruise it remains restrained and comfortable; push the Renesis toward the redline and the note becomes noticeably more serious and rewarding without crossing into antisocial territory.

Is this a full exhaust system or just the rear muffler section?

This is a cat-back system that replaces the standard rear silencer. It works from the catalytic converter rearward, making it a natural complement to an upgraded high-flow cat in the mid-section if you want to address the full exhaust path.

How does fitment compare to the OEM exhaust?

Josh rates the fitment as essentially OEM-perfect based on fitting this system to multiple RX8s. Owners should expect a straightforward installation using the factory mounting points with no cutting or fabrication required.

What does the exhaust look like under the bumper?

The rear section features a silver finish that presents cleanly under the bumper. It complements an AUTOEXE-themed build without looking aftermarket in a heavy-handed way.

What other parts pair well with this cat-back exhaust?

The GP SPORT Exas High-flow Power Catalyser addresses the mid-section upstream, making the two a logical pairing for a complete exhaust upgrade. Adding the ODULA Racing Exhaust Earth Strap Set at the same time maintains a solid earth path across the entire exhaust system.

Is this exhaust suited to a daily-driven RX8 or mainly track use?

Josh specifically positions this system as the refined OEM-plus choice for owners where sound quality and daily comfort matter as much as outright volume. It is designed to reward a committed drive without making the daily commute uncomfortable.