Rear Swaybar Upgrade for 2019+ Mazda 3 & CX30 & 2022+ CX50

Introducing the CorkSport Rear Sway Bar for 2019+ Mazda 3 and CX-30. Improve your handling characteristics, reduce body roll, and reduce understeer by adding a sway bar to the rear of your GEN4. We tested multiple diameters and settled on a 7/8” diameter solid bar to ensure minimal impact on ride quality but with a big bonus to handling.

With fitments for both AWD and FWD setups, you can be sure there is an upgrade that’s perfect for your car. Read on for details and check out the release blog for even more info!

Read the blog:Reduce Body Roll With The New CorkSport Rear Sway Bar

#4thGenMazda3!

The CorkSport Advantage

Racing Inspired:

With our experience racing our old Mazda 2, we knew right away that we had to figure out a rear sway bar for the GEN4’s torsion beam suspension to help fight understeer. Since there is no OEM sway bar, we had to get creative. The CorkSport GEN4 Mazda 3 sway bar bolts directly to the torsion beam of the vehicle, similar to our Mazda 2 Torsion Bar. Since a torsion beam essentially acts as a sway bar, adding on extra material offers the same effect as moving to a bigger bar with a more typical suspension.

Mazda3 2020 Handling Improvement Blue Sway Bar

Handling Boost:

The main goal of the CS rear sway bar is to improve handling. By effectively stiffening the torsional rigidity of the rear torsion beam, understeer is reduced, body roll is reduced, and handling feel is improved. We chose a 7/8” diameter solid bar for the right balance of understeer reduction without dangerous oversteer. You can get the car to rotate if you’re really attacking an autocross course but don’t worry, it is perfectly controllable and safe for daily driving and hitting a backroad.

Fitment Focused:

While the concept is similar to our Mazda 2 bar, the design had to be totally unique in order to fit the GEN4 Mazda 3 just like an OEM part. We ended up with a separate design for both the FWD and AWD versions to really optimize fitment. There is one minor drawback for installation though. Some plastic aerodynamics pieces must either be removed or trimmed for fitment. We tried to avoid this; however, it was a necessary evil in order to utilize optimal mounting locations.

Materials & Manufacturing:

Like all CorkSport sway bars the GEN4 Mazda 3 bar is made from 4130 steel for great strength and consistent performance over time. We finish off the bars in CS blue powder coat for FWD vehicles and red powder coat for AWD vehicles. This ensures a great look and corrosion resistance. Each rear sway bar kit also comes with all the hardware needed for installation, all of which is made from stainless steel so it’s sure to stand the test of time. We even use locking nuts so you can be sure your sway bar stays where it’s supposed to.

Removal or minor trimming of plastic aerodynamic components is required for installation. See installation instructions for details.
AWD vehicles that are extremely low and/or bagged will need to verify clearance from the top of the sway bar to all other components of the vehicle to ensure safe operation.
Cannot install on AWD vehicles with a lift kit. The sway bar will interfere with the differential/driveshaft system.

Additional Features

Vehicle Fitment: 2019+ Mazda 3 FWD, AWD and Turbo. 2019+ Mazda CX-30 FWD, AWD, and Turbo.
Developed in America: Designed, tested, and proven in Vancouver, Washington.
CorkSport Service and Support: Receive a 2-year warranty, full-color installation instructions, all of the needed installation hardware, and knowledgeable telephone installation support.

How To Install the CorkSport Mazda 3/CX-30 Rear Sway Bar

It will take you Approx. 1 hour to install the Mazda Rear Sway Bar .

1 hour Install Time

2/5 Difficulty

2-Year Warranty

No CEL

The RSB is a game changer to the handling of these cars. Some might say it’s really not necessary since the 4th gen has a torsion beam suspension in the rear, but it truly benefits tremendously from it (hence why it’s used in Mazda2 racecars that have same suspension). The RSB allowed me to kick the end out on curvy roads aiding in removing that disgusting understeer. It also made the car turn a lot flatter on the track.

Anthony Alvarez del Real01/21/2024, 01:46 PM

Easy installation. Works great. Install tip: Use zip ties before tightening the sway bar. It will help with increase bar clearance.

Chris Sistoso10/26/2023, 03:50 PM

If you want your 4th gen to handle better this mod is a must. The installation process wasn't hard thanks to Corksport's instructions. The handling was dramatically improved thanks to the rear end being a lot stiffer.

Matthew Archer08/27/2023, 05:26 PM

Amazing. Should just come in a kit with the lowering springs. Changes the entire way the rear of this car handles. Floppy noodle to firm and controlled. Nice!

Kelsey08/11/2023, 04:46 PM

This was the first mod on my 2023 Mazda3 AWD Hatch. Took me right around 2 hours to install using ramps to lift the car as someone with zero experience working on cars. Can definitely feel a reduction in body roll and can take on on-ramps more confidently at faster speeds. When turning sharply, it almost feels like the car is squatting in the back, not in a bad way, but I think that the increased rigidity in the back has emphasized the roll in the front. I think the addition of a front strut tower brace would really bring the whole package together. That being said, I took the car out to the Blue Ridge Parkway and am pleased to say that the car handles tighter and is more fun in the twisties. I will be participating in two autocross events at the beginning of August and will update this review with my experience with the rear sway bar upgrade installed compared to before.

Ethan Mains07/17/2023, 12:46 PM

I own a 2022 Mazda 3 Turbo Hatchback, so this review will be in respect to that.

Quality and Installation:
The quality is great, and it is really heavy duty. Installation was not too difficult, and took about 2 hours or so. Very straight forward, and the provided instructions were perfect. I only had trouble torquing one of the nuts because there was interference between the rear spring and my torque wrench, but that could have been mitigated if I had the proper extension.

Driving Impressions:

I currently have 16” wheels with CrossClimate2 tires (winter set of wheels and tires) and I have only been able to drive this in the rain. But wow is it a noticeable difference. Body roll is greatly reduced and I have much more confidence going around corners, especially on the highway. Before, if you jerked the wheel back and forth, you could feel the rear end kinda of float around. Now, it doesn’t float much at all and is pretty snappy. The reduced body roll is the main compliment I have of this product though.

I installed the Front Strut Tower Bar as well, so my impressions are based on both simultaneously. I have heard that the Rear Sway Bar makes a much bigger difference though, so that is why I left a review here. I do recommend getting both though.

Austin Storms04/30/2023, 03:30 PM

I installed the CorkSport Rear sway bar on my 2021 Mazda 3 AWD NA AT.
My previous performance modifications are: Ultra Racing: Strut bar, Front lower bar, CorkSport: Rear engine mount, Auto Exe: Floor crossbar.

The Cork Sport rear sway bar is the most substantial rear sway bar that I have ever seen. It is both thick and solid, quite heavy and substantial. This the case even when I have bought performance sway bars for other vehicles in the past.
The installation was quite straight forward with the provided instructions that Cork Sport provided.
The step of cutting the aero pieces for the torsion beam felt a little awkward for me and not the most satisfying thing I have done on my car. Although, with a little bit of work, I think it fits pretty well when it's trimmed still. Also, as opposed to what it says in the instructions, I have torqued the brackets all the way. And then I settled on a way bar placement then torqued the sway bar all the way. This way the nuts were more easily accessed for the ones that are close to the sway bar.

The feeling on the back of the car is substantially improved and corners much more stably. The back is much more planted now. Finally I do not feel like the car is a little bit like a toy car. Finally I do not feel like something crucial is missing in the handling of this car. Now I am able to appreciate the unique handling of this car.

Although the Ultra Racing front strut bar made a vast difference to how fast I can corner with this car, no upgrade I have made made the car feel as planted as this. I am very happy with this upgrade and recommend it to everyone who don't mind adding more weight to their car's suspension to achieve better handling, comfort and driving joy.

Alp Tunali02/04/2023, 10:34 PM

My daily route to work is made up of hills, straights and twisties. Even with the front strut tower brace you can still feel somebody roll. Never had a rear sway bar before and was not a believer of it the reason I was late in ordering one. I installed my CS Sway bar and what the hell attacking those twisties are more fun and you are more confident. The car is so planted and having more fun. THis is a must have for the M3TH.

M3TH Rosillo01/23/2023, 04:36 PM

Installed this on my 21 hatchback and took it to VIR, where I ran the car in stock from last year. Rear body roll was much better controlled, overall handling was much more balanced, and the body weight transfer no longer wanted to unsettle the car into VIRs hog pen corner. Big improvement over stock with minimal effort and no penalty in daily comfort. Great product from Corksport, I’ll be back for more!

Eric12/12/2022, 11:51 AM

Okay so earlier this spring, I had taken my 4th gen to the Tail of the Dragon, and it was destroying that road, feeling great, but my main issue was my rear end kept sliding out, kept experiencing body roll around these tight hair pin turns. Only suspension mod being coilovers at the time.

We went back to the Dragon after installing this rear bar.., and let’s just say, we slayed that Dragon. The car responded to the turns better than ever, body roll was none existent. Full sending was an understatement. This rear sway bar is a must if you’re looking to keep control on some tight turns, and really looking to put the AWD to work

Brandon Winkle10/23/2022, 07:33 PM

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What size are the nuts and bolts included with the kit?

Asked by Zach | 07/24/2023, 12:00 PM | 1 answer(s)

The instructions aren't exactly clear on this issue.... Are there aero covers on a 2022 FWD Mazda 3. A quick glance under the car didn't seem to show any.

Asked by John | 06/24/2023, 08:26 AM | 1 answer(s)

I have a 2022 M3HTPP, stock color PQM, wrapped color blue. I'd really like the blue sway bar, but is there a diff btw blue/red sway bars, and how would I select blue during ordering?

Asked by Enoryt Diov | 04/30/2023, 07:00 AM | 0 answer(s)

Is this an upgrade for the cx30 turbo or just for the N/A's?

Asked by Scott | 02/11/2023, 03:28 PM | 1 answer(s)