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HKS RX8 Exhaust - Legamax and SE3P Options for Your Build

HKS RX8 exhaust systems are built for rotary owners who want a proven aftermarket system from one of Japan’s most respected performance brands. Whether you’re researching the Legamax range or tracking down a specific HKS reference for your SE3P, this is your starting point.

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$ 20 — $ 13000

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Mazda RX8 oil additive HKS ADD-II 200ml silver can with black cap

HKS ADD-II Engine Oil Additive 200ml for Mazda RX8 (Series 1 & 2, 2003-2012)

Organic molybdenum treatment that reduces friction and targets dry-start wear in the Renesis rotary. A considered addition to any RX8 oil service.

$45

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

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.

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.

HKS RX8 exhaust systems are built for rotary owners who want a proven aftermarket option from one of Japan’s most respected performance brands. If you’re researching the Legamax range or tracking down a specific HKS reference for your SE3P, this is your starting point.

Why RX8 owners choose HKS

The rotary engine breathes differently to a piston engine. It’s high-revving, sensitive to exhaust backpressure, and rewards a well-matched system more noticeably than many conventional platforms. HKS designs their systems with this in mind. For example, mandrel-bent pipework and tuned outlet sizing work with the 13B-MSP’s exhaust pulse characteristics. Quality stainless construction also contributes to long-term durability.

As a result, the system feels alive climbing toward the redline. In addition, the note suits the engine’s character without becoming intrusive at everyday speeds.

Choosing the right RX8 exhaust from HKS

  • System range: The HKS Legamax is the most searched exhaust system among Australian RX8 buyers. Therefore, check individual listings to confirm current availability.
  • Part reference: If you already have a reference such as HKS 32018-AZ002, use it to match directly to the correct listing. This way you avoid fitment uncertainty.
  • Vehicle code: SE3P references confirm fitment to the RX8 platform. For example, this is useful when cross-referencing HKS’s own catalogue or a Japanese-market listing.
  • Series fitment: Always confirm whether a listing covers Series 1 (2003-2008) or Series 2 (2009-2011). However, exhaust routing and tail trim details can differ between series.

Buying HKS exhaust components in Australia

Sourcing genuine HKS parts in Australia means confirming the correct RX8 exhaust specification for a right-hand-drive SE3P. Left-hand-drive or market-specific variants are not the same fit. However, each listing in this range includes the details you need to make that call. Browse the products below and check the individual fitment notes. Finally, if you’re building around a specific HKS reference, use that part number to go straight to the right listing.

Frequently Asked Questions

What HKS exhaust products are available for the RX8?

The HKS range for the RX8 includes exhaust options from the Legamax series, referenced under the SE3P chassis code. Check each individual listing for current availability, fitment details and part references before ordering.

What is the HKS Legamax exhaust for the RX8?

The HKS Legamax is an aftermarket exhaust range produced by HKS for the RX8 platform. Individual listings carry the specific part references and fitment details you need to confirm compatibility with your car.

Does HKS use the SE3P chassis code when listing RX8 exhaust parts?

Yes. HKS references RX8 exhaust parts under the SE3P chassis designation, which is the factory code for the RX8. Using SE3P alongside the HKS part number is the most reliable way to confirm you are looking at the correct listing.

What is HKS part number 32018-AZ002?

HKS 32018-AZ002 is an exhaust part reference associated with the RX8 range. Check the individual product listing for the full fitment details, specifications and description relevant to that part number.

How do I make sure I order the right HKS exhaust for my RX8?

Use the HKS part number, the exhaust range name such as Legamax, and your vehicle's SE3P reference together when checking listings. Confirm all fitment details directly on the individual product page rather than relying on a broad search term alone.

Is HKS a reputable brand for RX8 exhaust upgrades?

HKS is a well-established Japanese aftermarket manufacturer with a long history in performance exhaust development. Their products are designed to defined specifications and carry traceable part references, which makes it straightforward to confirm exactly what you are ordering for your RX8 build.