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CUSCO Strut Brace Type OS (Rear) for Mazda RX8 (Series 1 & 2, 2003-2012)

Reinforces the rear suspension towers on Series 2 cars for more stable, predictable cornering response with a true bolt-on fit.

Mazda RX8 rear strut brace fitted across luggage bay behind rear seats

$300

A Mazda RX8 rear strut brace addresses one of the most accessible flex points on the chassis. Chassis movement at the rear towers allows suspension geometry to shift under cornering load. This Type OS brace links those towers rigidly, giving the suspension a stable platform to work from. The result is cleaner, more predictable rear response through bends and direction changes.

In Josh’s staged chassis approach, upper bracing at both ends is the recommended first step. Front and rear tower braces tackle the most accessible flex points before progressing to underbody or lower reinforcement. This rear brace fits that role precisely. Pair it with the front equivalent to complete the upper chassis layer.

Mazda RX8 Rear Strut Brace, CUSCO Type OS Features

  • Oval-section aluminium bar delivers rigid rear tower support while keeping overall weight low.
  • It mounts directly to factory points, so no body modification is needed for a true bolt-on install.
  • Series 2 specific fitment suits the 2009-2012 rear tower geometry for a precise, rattle-free mount.
  • CUSCO’s blue-anodised end plates give the brace a purposeful, finished look in the rear cabin.
  • Finally, this Type OS rear brace is engineered in Japan by CUSCO, whose motorsport-derived catalogue has underpinned Japanese performance cars for decades.

For RX8 enthusiasts, the difference shows up at turn-in on a tight corner, through a quick left-right transition, and as the rear settles under braking. The chassis feels more tied together. The suspension communicates more clearly, responding to inputs rather than absorbing them in unwanted flex.

This Mazda RX8 rear strut brace pairs directly with the CUSCO Strut Brace Type OS (Front) with Brake Cylinder Stopper, which completes the upper chassis layer at the front towers and adds brake master cylinder bracing in one step.

For owners ready to develop the lower chassis, the AUTOEXE Lower Arm Bar (Front) is the logical next step, stiffening the lower front structure and extending the gains from upper bracing into a full chassis package. Learn more about CUSCO’s engineering philosophy at the CUSCO official website.

Additional information

RX8 Model

SKU CU-RSB-S1S2 Category Types , Brand:

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This ram air intake system is one of the best Mazda RX-8 upgrades you can make to your Series 2 (2009-2012). Ram air intake upgrades are among the top Aftermarket mods you can buy from CUSCO for owners who want better performance and reliability from their RX8. If you are looking for rx8 ram air intake for sale in Brisbane (QLD), Sydney (NSW), Melbourne (VIC), Canberra (ACT), Adelaide (SA), Darwin (NT) or Perth (WA), you’ll find high-quality Japanese Bracing upgrades at RX8 Upgrades.

Frequently Asked Questions

Which RX8 does the CUSCO Type OS rear strut brace fit?

The CUSCO Strut Brace Type OS (Rear) is designed specifically for the Series 2 RX8, covering the 2009-2012 model years. It is not a universal fit and is engineered to match the rear tower geometry of the Series 2 car for a precise, rattle-free mount.

Does fitting this rear strut brace require drilling or modifying the body?

No body modification is required. The CUSCO Type OS rear brace mounts directly to existing factory points, making it a true bolt-on installation for Series 2 RX8 owners.

What does a rear strut brace actually do on an RX8?

Under cornering load, the rear suspension towers can flex relative to each other, allowing geometry to shift mid-corner. The CUSCO Type OS rear strut brace links those towers rigidly, giving the suspension a more stable platform to work from. The result is cleaner, more predictable rear response through bends and direction changes.

What material is the CUSCO Type OS rear brace made from?

The brace uses an oval-section aluminium bar with blue-anodised end plates. The oval section provides rigid tower support while keeping overall weight low, and the anodised finish gives it a purposeful, finished appearance inside the rear cabin.

Should I also fit a front strut brace at the same time?

Fitting both front and rear upper tower braces together is the recommended approach, as it addresses the most accessible flex points at both ends of the chassis before moving to underbody or lower reinforcement. The CUSCO Strut Brace Type OS (Front) with Brake Cylinder Stopper is the direct front companion, completing the upper chassis layer in one step.

What should I add after fitting the front and rear strut braces?

Once the upper chassis layer is in place with front and rear tower braces, the logical next step is lower chassis reinforcement. The AUTOEXE Lower Arm Bar (Front) stiffens the lower front structure and extends the gains from upper bracing into a more complete chassis package.

Where is the CUSCO Type OS rear strut brace made?

It is engineered and manufactured in Japan by CUSCO, a brand with a motorsport-derived catalogue that has underpinned Japanese performance car development for decades.