Home > Manufacturers > Street Unit Performance > Engine Mounts >

The Original StreetUnit Billet Aluminum Rear Engine Mount: MAZDASPEED 3/Mazda3/Mazda 5

MAZDASPEED 3 Motor Mount

Our Price: $115.00

Availability:: Ships Immediately
Product Code: SUM3AMM


Street Unit Performance Billet Aluminum Rear Engine Mount
The Original Mazdaspeed rear motor mount, created in 2007-2008.
Proven design with thousands of units on the market.

Application: MAZDASPEED 3, Mazda3, and Mazda 5 (AT & MT)
StreetUnit Motor Mounts are completely redesigned from the OEM mounts and engineered to provide the user with maximum benefit without excessively increasing vibration. They are CNC machined out of billet aluminum and the bushings are 62A durometer urethane. The two piece aluminum and steel design is reinforced by two grade 12.8 allen key bolts with a yield strength of 160,000 psi, topped off with locktite. The 2 piece aluminum/steel design is stronger than a 1 piece aluminum or welded mount.
Benefits of Street Unit Engine Mount Replacements:
  • Reduce unwanted "wheel hop" that plagues the FWD MS3 and Mazda3
  • Solid 70A durometer bushings
  • Recover torque lost in the drivetrain
  • Billet aluminum is aesthetically very pleasing in the engine bay
  • Minimize drivetrain lash
  • Must have for all MS3's
  • Bolt-on installation and does not require the motor to be removed or supported

Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 64 Write a review.

  0 of 0 people found the following review helpful:
5 of 5 Lasted 10 Years! November 18, 2018
Reviewer: Paul from North Carolina  
I bought this rear motor mount in 2008 shortly after purchasing my 2007 Speed3.  It was an immediate improvement over the stock motor mount and has lasted 10 years without any troubles.  Just recently I noticed some slight thunking coming from under the car when transitioning from reverse to 1st.  Suspicious it was the motor mount, I pulled it and found the upper bushing hole was slightly oval and this was further confirmed by the scuff pattern on top of the billet aluminum.  No worries, I'm ordering the 70 durometer bushings to replace the original 62 durometer bushings.  I'm very pleased with the performance of the mount, and I have no complaints at all after 10 years of use.  I hope to get another 10 with another set of bushings!

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 WOW! September 8, 2012
Reviewer: Justin Holst from Goddard, KS United States  
Just installed, too easy by the way! Such a difference in driving characteristics! Shifts feel more firm, wheel hop is so small almost not noticable. As for the vibrations, there are some, but only from a dead stop low rpm 1st gear and idle with A/C on... on the highway, nothing! Would def recomend!

Was this review helpful to you?

  1 of 1 people found the following review helpful:
5 of 5 2 years later AND August 6, 2012
Reviewer: Sam Short from East Islip, NY United States  
It still does the job. I bought this at first because i was having probs with my synchros and thought this might solve the problem. Before it came in, my prob got worse and eventually MazdaCorp just replaced 2nd gear synchro for me cause it was "defective" @ 400 miles :/ ... While they replaced that, a bunch of parts i ordered came in, including this motor mount. I asked Mazda if they'd be cool putting it in and they were happy to do it. They knew right away and recommended it too. Needless to say once i got my car back, the car vibrated alil more at a dead stop idle. Not a whole lot more but if u had like an empy soda can in ur cup holder, you'd hear it rattle now. I don't notice it anymore, cept cans ratteling. Shifiting is better than new and still 2 years later feels great. Replace my shifter bushings next since those are rubber and crappy like the stock RMM... This is a must buy!

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 What vibration July 30, 2012
Reviewer: toprock from Alexandria,†VA†United States  
When I heard about this mount until the moment I ordered and received it, I was mentally preparing myself for the Vibration and Chatter everyone was talking about...As soon as I started my car after installation I asked..."What vibration?" I can barely feel if any vibration. Maybe that's because I didn't have my AC on...but I DID have my heater on...Anyways did a test drive and MAN 1st and 2nd are smooth like butta...did a couple hard launches...very little wheel hop now. If you like me hate the vibration(especially with A/C on) I recommend buying this product NOW during winter, so by the time Spring/Summer rolls in it will be broken in already...I feel very little if at all no vibration. Car runs smoother, I feel the power hitting the ground now. Definitely worth every dollar! BUY THIS NOW!!

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 No hop, better shifting and better handling July 21, 2012
Reviewer: Anonymous Person from Tamarac, FL United States  
I bought this with the SU side mounts and it was the best investment ever. Small vibration with the AC on while the car is in idle but nothing exagerating. No wheel hop and i was able to feel the true power of this MS3. I recommend this and side mounts specially since the stock motor mounts are not that durable.

Was this review helpful to you?

View All Customer Reviews