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Vancouver, WA


M-TH 9A-5P | F 9A-12P | SA-SU CLOSED

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2019+ Mazda 3 & CX-30 Performance Rear Motor Mount - All Models

Old price: $219.99  
Price: $206.79
You save: $13.20 (6%)
Price in points: What are Points?207 points
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The CorkSport Rear Motor Mount replaces the soft rubber OEM RMM for the Mazda 3 & CX-30.
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When out carving the back roads, the feedback that is gathered from the vehicle directly contributes to the confidence level that you have as a driver. That is why we sought to improve the confidence that you get from your 2019+ Mazda 3 & CX30. One of the main components that play a big part in the level of feedback you get from your Mazda, is the Rear Motor Mount or RMM. The OEM RMM features a soft rubber material that leads to excessive engine movement. This movement results in a decrease in throttle response, shifting feel, and vehicle feedback. The CS RMM was designed to eliminate these issues with the OEM mount and give you the driving experience you want when hitting the back roads.

The All New Rear Motor Mount OEM vs CS for Mazda 3 & CX-30 - CorkSport

The CorkSport Advantage

Mazda 3 Performance Race Poly Mount

Materials & Manufacturing:

The CorkSport Rear Motor Mount is designed to be a direct replacement for the OEM RMM and installs just as easily. This leads to a simple and quick process that will increase the feel and performance of your Mazda 3 in no time.

2023 Mazda performance rear engine mount

Design Focused:

The CS RMM features high-quality materials and a design that delivers on reducing engine movement and increasing feedback to the driver while not being overwhelming during daily driving. This is accomplished through the utilization of the RMM body which is made out of A356-T6 aluminum and is precision machined to accept the 70A polyurethane bushings that eliminate much of the unwanted motor movement.

turbo Mazda 3 poly bushing mount

Performance Polyurethane:

The selection to use a 70A durometer poly bushing was for its ability to provide a substantial improvement in reducing the engine’s movement, while not being overly aggressive. Using these bushings does increase the NVH in the car, but we think it is well worth the benefits and it is still pleasant when daily driving.

2021 Mazda 3 RMM Bushing Sleeve

Steel Poly Sleeves:

The CS RMM bushing sleeves are precision machined out of steel to provide a robust and durable part that is then zinc coated to provide protection against corrosion.

2019 Mazda 3 BP Rear motor mount RMM Hardware

Stainless Hardware:

Anchoring the new performance RMM in place is a hefty M14 stainless steel bolt, washers, and nylock nut. Corrosion-resistant SS will stand up to the harshest road conditions.

turbo Mazda 3 rear motor mount weight

Weight Savings:

While minor, everything adds up, the CorkSport Rear Motor Mount shaves 2.50 pounds from your Mazda. Reducing weight from 4.70* to 2.20. *OEM Turbo model RMM weight.

Product Advisory Note
  • NVH: Noise, Vibration, & Harshness in the vehicle cabin will be increased with the use of the CorkSport rear motor mount due to the increased stiffness.
  • The CS RMM will have the most noticeable NVH at idle and just off idle RPM range, especially when using the A/C.

Additional Information

  • Vehicle Fitment: 2019+ Mazda 3/CX30 Naturally Aspirated & Turbo, AWD & FWD.
  • Designed in America: Designed in Vancouver, Washington, in the Pacific Northwest.
  • CorkSport Service and Support:: 2-year limited warranty, full-color installation instructions, all necessary components, and knowledgeable telephone support at (360) 260-2675.

How To Install Rear Motor Mount for Mazda 3 and CX-30

It will take you 1 hour to install.

1 Hour Install Time

1 Hour Install Time

Difficulty: 3/5

3/5 Difficulty

2-Year Warranty

2-Year Warranty



Link to a step installation instructions for the Rear Motor Mount Mazda 3

Some may get this car for a soft luxurious ride but those that are ready for that next level of sportiness need the RMM. It adds a connection to the car that makes you absolutely fall in love with it. You can FEEL your RPMs climbing as you push the pedal making the car feel like it’s alive! Another great improvement from the RMM is throttle response and handling. With the motor/trans moving less it allows the power transfer to the wheels faster allowing for a more responsive feel to the car. The less movement also helps with handling by not letting the weight of the motor shift from side to side.
This engine mount made the throttle response better and the added NVH made me feel more connected to the car. The installation was easy thanks to Corksport's thorough instructions.
The change to steering and shifter feel was much more prominent than I expected, wow. Love love love how this makes the car drive. That said, it does make me deeply loathe my 2019 6MT hatch and the cylinder deactivation system it has. The NVH at many RPMs when running on just cylinders 2 and 3 is so harsh it resonates like heavy bass through the cabin if you have the windows closed. I'd give it 1 star based on how it makes my 2019 Mazda3 feel like a 2002 Protege5 with 100k miles of rattles, but actually I sort of love that about it. The car feels more raw, I feel more connected, and yet it still has a refined interior. Practice mindfulness, be at peace with the rattles. It's a Mazda after all.
Super easy to install, and CS's instructions are always easy to follow and include all the torque specs + torque pattern. My RMM sleeve insert wasn't fully seated inside the bushing so it wouldn't slot into the subframe at first. Some quick work with a vice and a mallet fixed that. This thing changes the character of the car completely. If you want to keep the quiet, supple/luxurious feeling of the car as Mazda intended, this mod is definitely not for you. If you're looking for that boy racer hot hatch vibe, then you definitely need this. The newly introduced NVH reminds of an old Honda Prelude with an aftermarket exhaust. The car has a resonance between 1200-1500rpm that kind of feels like slipping a clutch just up to the point of stalling. With such a low revving engine, you're in this rev range a lot when bombing around town. This diminishes the higher the revs go. I actually love this new character and it makes the car feel more alive/raw, and very nostalgic of old JDM cars I've driven in the past.

Performance wise I don't think I notice a huge difference off the line like some reviews suggest, but the car certainly has snappier upshifts when using the paddle shifters. The on-center steering feel is also heavier, making it feel much more precise (I don't know if this is due to the RMM, the AutoExe brace, or a combination of both). All in all a very good value for money mod.
This is one of the best mods you can get for your Mazda. Really makes you feel more connected to the car and improves the response. After 2K miles most vibrations are gone, just a little at low rpm getting off the line. Be aware though it will bring out some rattles in the cabin which I haven’t been able to sort out
The good news - Amazing difference in side to side steering accuracy and handling along with the car jumping with much better throttle response when I goose it. It really works well

I have had different RMM's/"dog bone" mounts/inserts on my 2 previous vehicles so I can safely say from experience that the vibrations are definitely too intense for a daily that's used in D to commute with. I'm actually really surprised after a good 4k miles that it still this intense under load at low RPM's. I can't help but feel a little disappointed as this is an amazing near solid design with pretty thin poly bushings, so they really should have used a softer durometer and being so solid would not have lost much at all in the positives gained but would likely make all the difference in not rattling the heck out of me. The vibrations themselves are close to bearable but sadly has brought out all kinds of rattles my car didn't have before. I've put foam strips in the glove box, but will require a ton of disassembly and putting insulation in the doors, etc.

If you look at RMM designs for other cars you will see how most have much thicker poly bushings, so the durometer of the poly used is a good indicator of how much vibration you will get but with this having such thin bushings, the 70a on here feels like an 88a on Focus or MS3 type RMM and my beautiful modern car rattles like an old race car, not what I wanted on a sleek modern ride.

Seriously hoping a softer durometer bushing option is offered!
This in my third performance upgrade on the Mazda 3.
The previous upgrades I made are a one piece strut bar and a front lower bar.

Compared to my 2011 Mazda 6 with a 88 durometer AWR Racing dog bone mount. The stock 2021 Mazda 3 felt lacking in the responsiveness department. I am aware that this in not solely due to the stock rubber rear motor mount.

After installing the 70 durometer CorkSport rear motor mount. The difference is amazing. The car now feels much more useable. The power delivery is much more aggressive, and quicker. The car feels more planted while accelerating. There is a more power in every gear. I can now hear the unique sound of the entire rpm band much more clearly. This is great for me to shift manually.
There is some added engine noise into the cabin as well as very very minimal vibrations. Mostly, it introduced engine noise though and not vibrations. The cabin engine noise is not just louder, it is completely changed in its characteristic. The engine sounds a little aggressive now. I quite enjoy a little engine noise in my vehicles, and this car now sounds quite nice.

Having taken out the old mount I can say that this mount is much much stiffer than the old mount, which is atrocious from the point of view of performance driving. This can easily be seen by inspecting both the mounts as well as driving characteristics introduced by installing either one of them. However, the 70 durometer mount offered by CorkSport is still a tad bit tame for me personally. I would definitely enjoy a little bit aggressive power transfer at the cost of more noise and vibrations. This though is for me personally and probably the 70 durometer mount will be optimal for when I have passengers in the car who may not appreciate a loud car.

The install was mostly very straight forward. Although the 22mm bolt did not line up with the engine brace and the engine mount from the get go. I tried jacking up the back as well, however this made the issue worse. Finally, with the front on ramps, I let the air out on both the front tires. This almost perfectly lined up the 22mm bolt holes. After pushing on the engine brace with some force I was able to line up the holes and get the 22mm bolt through. Other than this, it was a flawless install, quite enjoyable.

I should also mention, that the CorkSport mount, although slightly over engineered if you ask me, is much lighter than the bizarre stock engine mount.

I highly recommend this modification for those who don't mind minimal vibration and some cabin engine noise increase.
So far this is my favorite upgrade to the car. The front strut bar has been great too though.
Holy WOW, not only did it help with off the line jump and throttle response, it actually helped BIG with overall handling! So not only front to back control, but keeping the engine in place REALLY helped my steering feel and response while cornering I was shocked! Yes, there are more vibes, mainly under low RPM load, but well worth it and I'm sure it will settle down even more with time. So glad I upgraded!
Not the only thing stiff

Big things come in small packages. While this does give you some very flavorful vibrations, it’s actually very functional too. We took our 4th gen out on the Tail of the Dragon with and without this mount, and the overall difference was incredible. Faster throttle response out of turns, less engine movement, and overall better performance. The feelings between shifts feel a lot better now as well. Would recommend.
After driving around on a test unit for a bit (same as the release) my feedback aligns pretty well with the Corksport statement. I would say the feedback element of having the stiffer RMM done in the turbo automatic really helps bring together the harmony of throttle and vehicle action, providing a little more immediate feedback and reducing the "slush" feeling the stock RMM provides.

The added NVH and vibrations are minimal, and I agree that every little bit of weight savings we can get is important in our car.
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Will this fit my 2020 Mazda 6 2.5T?

Asked by Evan Kops | 08/22/2023, 05:46 PM | 1 answer(s)

Hello, I have installed RMM, and I did not use a torque wrench to verify torque specs My first drive with the new RMM is overwhelming harsh with the NVH. It doesn't seem normal, so my question is how much does it matter that I didn't torque to specs? I'm thinking I must have over torqued and the RMM can't do what it's designed to do? Is this correct? Thanks

Asked by Kevin Hankins | 02/15/2023, 09:18 AM | 1 answer(s)
Mazda performance parts financing is available with CorkSport

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