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AUTOEXE Lower Arm Bar (Front) for Mazda RX8 (Series 1 & 2, 2003-2012)

Steel-pipe brace reinforcing the front lower suspension mounting points to reduce alignment shift. It sharpens steering feel and tightens chassis response through corners and braking zones.

RX8 front lower arm bar installed beside gearbox casing and catalytic converter

Reviews from around the web

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

The bars are out of this world. At first when I saw the picture on the autoexe catoluge they look small but in person the bars are huge. Similar to the Cusco design of hollow strut bars these autoexe bars are the same, having a hollow design. The autoexe kit also came with an authentic serial code and were carefully designed to fit with no problems.

The front lower arm bar is very strong made out of steel and hollow inside. The front lower arm bar attaches onto the lower arm and onto the frame. In a X Brace member design. Unlike the cusco bar and the mazdaspeed the Autoexe lower arm bar is pinched between the lower arm and the chassis. With each ends conected to the two bolts of the lower arm. (Hard to describe but look at the pics) The rest of the bar connects onto the frame. There is a small kit that wedges/attaches itself onto the frame without drilling anything. The bar is also slanted on the right side for the header/downpipe.

Overall I'm very happy with the bars. The quality of the autoexe bars are excellant and the packaging and handling of the bars are superb. I found my turn in using the autoexe bar was more responsive then my old Cusco lower arm. As well my rear is more stable when exiting out of corners. The best part about these bars is probably the front member brace and the triangualar rear brace that strengthen up the chassis. Because with my current suspension setup to the max and without my roll cage installed yet, my cars chassis is flexing from the pressure and stress buildup that I put on it at the track. For the price I'm very satisfied. Even though the price isn't cheap and in some cases you can buy a car, but the bars are definatley worth the money.

$360

The RX8 front lower arm bar from AUTOEXE uses a steel pipe. It reinforces the left and right bases of the front lower suspension. This is the exact underbody load path that most affects steering precision. Part reference MSY460 confirms exact fitment across all RX8 models from 2003 to 2012.

Under braking and hard direction changes, chassis flex at these mounting points allows the suspension geometry to shift slightly. That shift blurs turn-in and adds vagueness to the steering. Bridging those mounts with this brace reduces that flex. It controls alignment change and restores a more direct feel through the wheel.

AUTOEXE RX8 Front Lower Arm Bar Key Features

  • Steel-pipe construction reinforces both left and right lower suspension bases. This targets the underbody load path most responsible for steering feel and alignment stability.
  • By reducing mount-point flex, the bar controls alignment change under load. The front end behaves more consistently from corner entry to apex.
  • This front lower arm bar acts as a genuine second stage in a front chassis build. It addresses the lower load path that a strut tower bar cannot reach, making it a complement to upper bracing rather than an alternative.
  • Universal carry-over fit covers the full production run with no modification required. It suits both Series 1 and Series 2 chassis from 2003 to 2012.
  • Finally, AUTOEXE has engineered Mazda-specific chassis parts in Japan for decades. This front suspension brace is built around the RX8’s own mounting geometry, not adapted from a shared platform.

For RX8 enthusiasts who trail-brake into corners or push the car on a demanding back road, the difference shows up immediately at turn-in. The steering gains a more planted, connected quality. The front end reacts to inputs rather than absorbing them through flex.

Pairing this bar with upper front bracing addresses the complete front load path, from the lower mounts to the strut tops. The natural companion is the CUSCO Strut Brace Type OS (Front) with Brake Cylinder Stopper. It covers the upper front load path and adds a brake cylinder stopper for a complete front brace system.

If you are also upgrading the suspension itself, the OHLINS MAS-MI00S1 Road & Track Coilover Suspension gives the RX8 front lower arm bar a properly tuned base to work with. The KTS SC Damper System Coilover Set is a strong alternative at a different price point. For the full AUTOEXE handling range, visit the AUTOEXE official website.

Reviews from around the web

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

The bars are out of this world. At first when I saw the picture on the autoexe catoluge they look small but in person the bars are huge. Similar to the Cusco design of hollow strut bars these autoexe bars are the same, having a hollow design. The autoexe kit also came with an authentic serial code and were carefully designed to fit with no problems.

The front lower arm bar is very strong made out of steel and hollow inside. The front lower arm bar attaches onto the lower arm and onto the frame. In a X Brace member design. Unlike the cusco bar and the mazdaspeed the Autoexe lower arm bar is pinched between the lower arm and the chassis. With each ends conected to the two bolts of the lower arm. (Hard to describe but look at the pics) The rest of the bar connects onto the frame. There is a small kit that wedges/attaches itself onto the frame without drilling anything. The bar is also slanted on the right side for the header/downpipe.

Overall I'm very happy with the bars. The quality of the autoexe bars are excellant and the packaging and handling of the bars are superb. I found my turn in using the autoexe bar was more responsive then my old Cusco lower arm. As well my rear is more stable when exiting out of corners. The best part about these bars is probably the front member brace and the triangualar rear brace that strengthen up the chassis. Because with my current suspension setup to the max and without my roll cage installed yet, my cars chassis is flexing from the pressure and stress buildup that I put on it at the track. For the price I'm very satisfied. Even though the price isn't cheap and in some cases you can buy a car, but the bars are definatley worth the money.

Additional information

RX8 Model

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SKU AE-LAB-S1S2 Categories , Types , Brand:

Related RX8 Upgrades

This front lower arm bar is one of the best Mazda RX-8 upgrades you can make to your Series 1 (2003-2008) or Series 2 (2009-2012). Front suspension braces 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 rx8 front lower arm bar 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 models does the AUTOEXE front lower arm bar fit?

The AUTOEXE front lower arm bar suits all RX8 models from 2003 to 2012, covering both Series 1 (2003-2008) and Series 2 (2009-2012) chassis with no modification required. Part reference MSY460 confirms the exact fitment.

What does a front lower arm bar actually do on an RX8?

It braces the front lower suspension mounting points, which are a known flex point under hard braking and cornering. Reducing flex at this location sharpens turn-in response and tightens overall chassis feel through direction changes.

Do I need this if I already have a front strut brace fitted?

Yes, the two products address different load paths. A front strut or tower brace works on the upper chassis; this lower arm bar targets the underbody mounting points that upper bracing cannot reach. Running both gives more complete front chassis stiffening.

Is this bar designed specifically for the RX8 or adapted from another platform?

AUTOEXE engineers this bar specifically around RX8 mounting geometry. The company has developed Mazda-specific chassis parts in Japan for decades, so the fitment and load-path targeting are native to the RX8 rather than carried over from a generic application.

Where does this fit in a staged chassis bracing build?

Most owners start with upper front bracing. The AUTOEXE front lower arm bar is the logical next stage, addressing the underbody load path once the upper structure is covered. For best results, removing factory play at subframe mounting points before adding this bar gives a cleaner foundation.

Is the AUTOEXE lower arm bar hard to install?

The bar is designed for direct fitment to the existing front lower suspension mounting points on the RX8. No modification to the chassis is required, and the confirmed MSY460 part reference means there is no ambiguity about compatibility before you begin.

What will I actually feel when driving with this bar fitted?

The most noticeable improvement is at turn-in: the front end responds more immediately to steering input and feels more composed under trail-braking. The difference is clearest on a demanding back road or when making quick direction changes, where chassis flex previously softened the response.