Ultimate Mazda RX8 Exhaust Guide

7th December, 2018 in RX8 Tuning

Tempted to get an exhaust to improve the looks and sound of your Mazda RX8? We’ve taken a look at the best exhausts in the market to bring you our Ultimate RX8 Exhaust Guide.

rx8 exhaust guide


In a hurry? Here is our RX8 exhaust summary

Budget Choice Drifted Choice Premium Choice
turboxs rx8 exhaust hks hipower rx8 exhaust borla rx8 exhaust
TurboXS Mazda RX8 Exhaust HKS Hi-Power Mazda RX8 Exhaust Borla Mazda RX8 Exhaust
$494.10 $630 $1,125.99
Buy Now Buy Now Buy Now

When the RX-8 was launched to the market in 2003, it had huge boots to fill to live up to the expectations of its predecessor, the legendary RX-7. Motoring enthusiasts around the world rejoiced as Mazda announced that the RX-8 would once again be rocking the incredible rotary engine. Unfortunately though, this time around, the twin-turbo’s were nowhere to be seen.

However, turbos aside, with a front-mid-engine, rear wheel drive layout, near 50:50 weight distribution and the insane 9,500rpm rev limiter, it was still an incredible car on paper and a dream of many true car enthusiasts.

Want get to your RX-8 handling right? Our RX-8 Coilover guide was written just for you.

Fast forward to the present day, and the RX-8 has left its difficult history behind. A lot of RX-8 owners would’ve undoubtedly purchased this awesome-looking car from new without really fully understanding the complex mechanical aspect behind it.

The RX-8 is still a beast in its own right and wasn’t so suited to people that would run it every day for their shopping trips without really fully understanding the workings and maintenance requirements of a rotary engine.

Take a look at this video for an in-depth guide on exactly how the rotary engine actually works.

There are undoubtedly some perfect engines still to be had out there, but the rotary certainly needs more care and attention than most engines on the market, and the economy certainly isn’t to everyone’s taste.

Luckily, this has meant that it’s struggled through the test of time and no longer desirable to most everyday owners, which means that we get an incredible car at a ridiculously cheap price!

There’s no question that the rotary engine is one of the most insane ever produced, and not only does it sound great in stock form, but Mazda actually managed to squeeze most of the potential out of the exhaust, which is extremely rare to see from factories.

With that being said, there’s certainly room for improvement. We’re going to show you the best exhausts on the market which will still give you some small gains, along with more impressive sounds and far superior looks.

Whether you’re looking for a little more response, to simply update the looks or to make it sound like a whole new beast, our list will help you decide which is the perfect exhaust for you. It’s time to hear the true potential of what your rotary engine has to offer!

Before we get started, here’s a teaser video to prepare your eardrums for what they’re about to enjoy!

As always, try not to get caught up in the power claims from our selection, exhausts will only offer a minimal amount and it’s far more important to get a setup which you love the look, and sound of. When watching videos, you’ll want to bear in mind that multiple variations (angle, camera, etc) can change how an exhaust sounds.

You’ll also want to bear in mind that some cars may have had additional exhaust modifications carried out (headers, cats, etc) when watching the videos. If you like the sound of one, try to check whether it’s had additional mods carried out.

Now that you’ve got an idea of what you’re looking for, let’s take a look at our Mazda RX8 exhaust selection!

GReddy Spectrum Elite Mazda RX8 exhaust

greddy rx8 exhaust

  • Internal pipe diameter: 60mm (2.4″)
  • Tailpipe configuration: Dual 102mm (4″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: GReddy
  • Price: $876.96
  • Our comment: JDM tuning legends GReddy kick off our list with their popular Spectrum Elite exhaust.

    GReddy has put their typical quality into creating this stunning system at a reasonable price. This is one of the quieter, more subtle sounds on the market, but with a fantastic tone.

    They also went on to later release the GReddy Supreme SP, which offers a larger piping diameter, for those of you considering bigger power, which is naturally also slightly louder. Both choices are great for different purposes, and you really can’t go wrong with either of these.

  • Manufacturer description: “Today’s sophisticated tuners want it all, and GReddy’s SE exhaust systems deliver the full spectrum of features desired in a street performance system. SE exhausts increase flow via tuned piping and larger, free-flowing mufflers for improved power, but provide discreet sound levels that won’t attract the wrong kind of attention.”

    “The exhaust note is comfortable and sporty, not loud. Each application is tested and tuned for USA spec. vehicles, so fitment and sound are confirmed. All SE Exhausts are tested to be well below the 95dBA standard.”

  • Purchase link: GReddy Spectrum Elite Mazda RX8 exhaust

GReddy Spectrum Elite Mazda RX8 exhaust video


Agency Power Titanium Tip Mazda RX8 exhaust

agency power rx8 exhaust

  • Internal pipe diameter: 76mm (3″)
  • Tailpipe configuration: Dual 102mm (4″) tips
  • Primary exhaust system material: Stainless Steel with Titanium Tips
  • Fitment: Mazda RX8 (2004-11)
  • Manufacturer: Agency Power
  • Price: $850.00
  • Our comment: This Agency Power exhaust is undoubtedly one of the most popular with RX8 owners and it’s certainly quite a bit louder than the GReddy.

    It may be too loud for most people when you’re on the throttle, but it’s surprisingly tame when cruising with a deep tone at idle. This exhaust is known for popping and banging frequently.

    This is certainly not one of the calmer exhausts in our list, but if you’re after a louder sound and don’t mind pops and bangs, this is a great exhaust at a great price.

  • Manufacturer description: “The need for power, quality, and style has once again been executed by Agency Power with their brand new complete exhaust system for the Mazda RX8. This new stainless steel exhaust system features a dual muffler setup with a titanium 4 inch tips etched with the Agency Power logo.”

    “The system utilizes T304 stainless steel 3 inch piping TIG welded with 1/2 inch thick flanges. The system includes the dual resonated midpipe for those racers wanting more horsepower and sound. The center pipe features a resonator to get the perfect tone and includes the bung for the factory O2 sensor. The Agency Power catback exhaust includes strong durable hangers and connects with factory hardware.”

  • Purchase link: Agency Power Titanium Tip Mazda RX8 exhaust

Agency Power Titanium Tip Mazda RX8 exhaust video


HKS Hi-Power Mazda RX8 exhaust

hks hipower rx8 exhaust

  • Internal pipe diameter: 76mm (3″)
  • Tailpipe configuration: Single 97mm (3.8″) tip
  • Primary exhaust system material: Stainless Steel with Titanium Tip
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: HKS
  • Price: $630.00
  • Our comment: Another legendary JDM tuning house enters the market, and if you thought the Agency Power exhaust was loud, HKS has arrived to cause an upset.

    For those of you that are looking for a loud, free-flowing exhaust and don’t mind the single exit look of the Hi-Power, there’s a definite bargain to be had here. Featuring a nice, deep tone, it’s not too loud if you’re light on the gas, but as soon as you put your foot down all hell breaks loose.

    The Hi-Power is one of HKS’s best selling exhausts of all time and this adjustable-length titanium-tip option has left RX8 owners rejoicing as it pops and bangs.

  • Manufacturer description: “Inspired and designed from endurance and GT racing in Japan, HKS developed its Hi-Power Exhaust system for both turbocharged and naturally aspirated applications.”

    “HKS has incorporated this new race inspired offset muffler and piping design into many street applications, which offers a greater flow and higher-PRM power gains due to the less restrictive design. This is achieved by eliminating unnecessary bends for the straightest exhaust path.”

  • Purchase link: HKS Hi-Power Mazda RX8 exhaust

HKS Hi-Power Mazda RX8 exhaust video


HKS Legamax Mazda RX8 exhaust

hks legamax rx8 exhaust

  • Internal pipe diameter: 65mm (2.6″)
  • Tailpipe configuration: Dual 100mm (3.9″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: HKS
  • Price: $1,199.00
  • Our comment: HKS return to our list with something a little different to the Hi-Power with the Legamax. This time around, they bring a far more subtle, dual-tipped offering at a higher price point.

    As you’d expect, the quality of this system is up there with the very best and it provides an incredible, clean sound, which won’t have you getting pulled over by the cops.

    If you’re after a great, clean-looking legal exhaust which is subtle when idling and cruising but comes alive when you step on the throttle, you’ll definitely want to take a look at this.

  • Manufacturer description: “Legamax Exhaust Systems are designed to reduce backpressure and increase exhaust flow for greater peak power and a broader torque band. Each Legamax application utilizes a specific muffler design and shape along with the appropriate piping diameter to maintain low-end torque while maximizing high-end horsepower. All Legamax systems are made from polished SUS304 stainless steel piping.”
  • Purchase link: HKS Legamax Mazda RX8 exhaust

HKS Legamax Mazda RX8 exhaust video


Borla Mazda RX8 exhaust

borla rx8 exhaust

  • Internal pipe diameter: 76mm (3″)
  • Tailpipe configuration: Dual 101mm (4″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: Borla
  • Price: $1,125.99
  • Our comment: This is undoubtedly in the Top 3 most popular exhausts for RX8 enthusiasts with many delighted long-term owners.

    Featuring a subtle look with a clean, aggressive tone. It’s perfect for those that are looking for a high-flowing system which comes alive on the throttle and pops without destroying your eardrums.

    It may be at the higher end of the price range, but we have no doubt you’ll love this exhaust.

  • Manufacturer description: “Borla Cat-Back and Rear Section exhaust systems feature patented straight through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power; driving excitement; fuel economy; and the distinctive Borla Sound of power respected enthusiasts everywhere.”
  • Purchase link: Borla Mazda RX8 exhaust

Borla Mazda RX8 exhaust video


TurboXS Mazda RX8 exhaust

turboxs rx8 exhaust

  • Internal pipe diameter: 76mm (3″)
  • Tailpipe configuration: Dual 101mm (4″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: TurboXS
  • Price: $494.10
  • Our comment: So you’ve probably looked at the price and thought to yourself “Yeah, okay. What’s the catch here?” When in fact, the TurboXS is surprisingly impressive.

    Many owners were undoubtedly tempted by the price and figured they’d give it a shot, and they’ve come back positively surprised.

    This is definitely the best bang-for-your-buck option on our list if you’re looking to go down the budget route. It provides plenty of sound without being deafening either. Highly recommended!

  • Manufacturer description: “TurboXS is one of the industries leaders in aftermarket performance. Through testing they have developed this amazing RX8 catback exhaust for the Mazda RX8. This exhaust is full stainless steel with beautiful rolled tips.”
  • Purchase link: TurboXS Mazda RX8 exhaust

TurboXS Mazda RX8 exhaust video


B&B (Billy Boat) Mazda RX8 exhaust

bb rx8 exhaust

  • Internal pipe diameter: Unknown
  • Tailpipe configuration: Dual 101mm (4″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: B&B (Billy Boat)
  • Price: $898.91
  • Our comment: The rather amusingly-named Billy Boat exhaust is one of the rarer choices on our list. B&B are known for their great quality, and this exhaust is no exception.

    This twin-exhaust is on the louder side, but certainly not the loudest on our list. It has many happy owners, but we’d personally opt for a different choice within the price bracket.

  • Manufacturer description: “Since 1985 B&B Performance Exhaust has designed, tested and manufactured the highest quality stainless steel headers and exhaust systems available. B&Bs experience has lead to evolved products that fit and sound as well as they perform, while able to withstand the harsh automotive environment. “
  • Purchase link: B&B (Billy Boat) Mazda RX8 exhaust

B&B (Billy Boat) Mazda RX8 exhaust video


Tanabe Medalion Touring Mazda RX8 exhaust

tanabe rx8 exhaust

  • Internal pipe diameter: 70-60mm (2.75-2.35″)
  • Tailpipe configuration: Dual 90mm (3.5″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2003-08)
  • Manufacturer: Tanabe
  • Price: $845.50
  • Our comment: Tanabe is generally one of the more popular exhausts in our reviews, but it seems to be a rather rare choice for RX8 owners.

    Known for their exceptionally high-quality systems with lower volume levels, Tanabe are typically known as “the gentlemans choice”. If you’re after a quiet yet stylish system which won’t attract too much-unwanted attention, we highly recommend looking at Tanabe.

  • Manufacturer description: “Tanabe exhaust systems are some of the finest quality exhausts in the world. Race developed and manufactured under extremely high quality standards, they excel in all categories. Performance, quality, and sound are carefully developed in each system and vehicle application. The special care we take in developing and constructing our exhausts results in the legendary ultra low deep tones that are pleasing at all rpm ranges. Tanabe exhaust systems are built for all forms of motoring.”
  • Purchase link: Tanabe Medalion Touring Mazda RX8 exhaust

Tanabe Medalion Touring Mazda RX8 exhaust video (with high flow cat)


APEXi Hybrid Megaphone EVO Mazda RX8 exhaust

apexi rx8 exhaust

  • Internal pipe diameter: 70-75mm (2.75-3″)
  • Tailpipe configuration: Dual 105mm (4.1″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2004-11)
  • Manufacturer: APEXi
  • Price: $759.00
  • Our comment: APEXi is a huge name in the tuning game, and their Hybrid Megaphone EVO RX exhaust is the cheaper of their two offerings which come at a reasonable price.

    As you’ve probably guessed, based on the name, this is the loudest of their two exhausts, but it isn’t excessively so. If you’re interested in the more expensive, quieter option then make sure you take a look at the APEXi WS2.

  • Manufacturer description: “The Hybrid Megaphone Evolution is a complete stainless steel exhaust system, from the main muffler canister and piping to the internal silencers, resonators, hangers, and brackets. This system provides both form and function which delivers durability, a sense of security, a comfortable sound, and overwhelming high-end power.”
  • Purchase link: APEXi Hybrid Megaphone EVO Mazda RX8 exhaust

APEXi Hybrid Megaphone EVO Mazda RX8 exhaust video


Fujitsubo Legalis R Mazda RX8 exhaust

fujitsubo rx8 exhaust

  • Internal pipe diameter: 76.3-60.5mm (3-2.4″)
  • Tailpipe configuration: Dual 90mm (3.5″) tips
  • Primary exhaust system material: Stainless Steel
  • Fitment: Mazda RX8 (2004-11)
  • Manufacturer: Fujitsubo
  • Price: $1,225.00
  • Our comment: Bringing unique, handmade precision with every exhaust, you can always count on Fujitsubo to come up with the goods.

    This is a great option for those who are looking for a quieter aftermarket system with a deep yet subtle tone which is ideal for daily use.

  • Manufacturer description: “Designed for street use, it improves both low-end and mid-range power. All LegalisR systems are constructed of Stainless Steel, and feature mandrel bent piping. Each application is tested to provide optimal power output for street use, while maintaining a deep and quiet tone, which is great for everyday use. Drivers of all ages and skill levels can appreciate the increased power output, and exceptional quality.”
  • Purchase link: Fujitsubo Legalis R Mazda RX8 exhaust

Fujitsubo Legalis R Mazda RX8 exhaust video


Our winner

There’s certainly a fantastic selection on the market for RX8 owners, but we feel that the HKS Hi-Power exhaust stood above the rest this time around.

The HKS Hi-Power blew us away in terms of price and performance and for that reason, it’s our RX8 exhaust of choice.

It may not be to everyone’s taste, since it’s one of the louder choices and has a single exit, but the HKS is fantastic quality at an incredible price which is undoubtedly one of the highest-flowing systems in our guide. All-in-all, it’s a fantastic package.

hks hipower rx8 exhaust

If we’re purely talking about looks, performance, and sound with a higher budget, the Borla is a true competitor. We could listen to its soundtrack all day!

For those that are looking for a bargain, we’re convinced but can’t afford the hi-power, or don’t want a single exit, the TurboXS is the ultimate choice.

Thank you for reading our Mazda RX8 exhaust guide

If you enjoyed this article then please share it with the sharing buttons at the side and the bottom of your screen.

Photography credits

We would like to thank the following sources for use of their photography:

Written by The Drifted Team Follow us for more drifting content like this. Visit the author's website