Vehicle Compatibility
Acura RSX Manual Transmission
- 2002 Acura RSX Manual
- 2003 Acura RSX Manual
- 2004 Acura RSX Manual
- 2005 Acura RSX Manual
- 2006 Acura RSX Manual
Honda Civic Si (EP3)
- 2002 Honda Civic Si
- 2003 Honda Civic Si
- 2004 Honda Civic Si
- 2005 Honda Civic Si
Transmission Type
- Manual Transmission Only
Always verify mount location and compatibility before ordering.
Why Upgrade Your Engine Mounts?
Factory mounts prioritize:
- Ride comfort
- Noise reduction
- Vibration isolation
While that’s great for commuting, it isn’t ideal for performance driving.
A performance mount can help:
Reduce Engine Movement
Keeps the drivetrain more stable.
Improve Shifting Feel
Reduces drivetrain slop during gear changes.
Increase Throttle Response
Power reaches the wheels more efficiently.
Improve Driver Feedback
Creates a more connected driving experience.
Many RSX owners report that upgraded mounts make the car feel significantly more responsive.
What Does the Front Right Mount Do?
The front right engine mount plays a critical role in controlling drivetrain movement.
Its responsibilities include:
Supporting Engine Weight
Helps secure the powertrain.
Managing Torque Movement
Controls engine rotation under acceleration.
Stabilizing the Drivetrain
Improves consistency during shifting.
When this mount wears out, excessive movement can affect both performance and comfort.
Understanding 70A Polyurethane
The “70A” rating refers to the hardness of the polyurethane bushing.
Why 70A Is Popular
It strikes a balance between:
- Street comfort
- Performance improvement
- Daily drivability
Compared to factory rubber mounts:
- Less drivetrain movement
- Improved durability
- Sharper response
Compared to very aggressive race mounts:
- Lower vibration levels
- Better daily comfort
- Reduced cabin harshness
This makes 70A one of the most popular choices for street-driven RSXs.
Improved Power Transfer
One major benefit of reducing engine movement is more effective power delivery.
How It Works
When the engine twists excessively:
- Energy is lost to drivetrain movement
- Shifts become less precise
- Wheel hop can increase
A stiffer mount helps keep the engine planted, allowing more of the engine’s torque to reach the drivetrain.
The gains aren’t horsepower increases, but they make the existing power feel more immediate.
Better Shifting Performance
K-Series owners often notice improved shifting after upgrading mounts.
Benefits include:
Reduced Drivetrain Slop
The transmission stays more stable.
Improved Shift Consistency
Particularly during aggressive driving.
Better Driver Confidence
Gear changes feel more precise.
This is especially noticeable on modified RSXs with upgraded clutches and short shifters.
Enhanced Durability
Polyurethane offers several advantages over aging rubber mounts.
Benefits
- Resistant to cracking
- Better heat resistance
- Longer service life
- Improved resistance to oil contamination
Factory rubber mounts often fail after years of exposure to engine bay heat and fluids.
Daily Driving vs Track Use
One reason 70A mounts remain popular is versatility.
Daily Drivers
Provides noticeable performance gains without excessive harshness.
Canyon Cars
Improves chassis feel and control.
Autocross Builds
Reduces drivetrain movement under load.
Track Cars
Offers better powertrain stability than factory mounts.
It’s one of the few modifications that benefits nearly every type of build.
Installation Notes
Installation Style
- Direct Bolt-On Replacement
No cutting or fabrication is required.
However, installation generally involves:
- Supporting the engine
- Removing the factory mount
- Installing the new mount
- Verifying proper alignment
Professional installation is recommended for best results.
Potential Trade-Offs
Performance mounts aren’t perfect.
Increased Vibration
Some additional vibration may be felt inside the cabin.
More Engine Feedback
Drivers will notice more drivetrain activity.
Break-In Period
Polyurethane mounts often soften slightly after initial use.
Most enthusiasts consider these minor trade-offs worthwhile given the performance benefits.
Pros and Cons
Pros
- Fits 2002-2006 Acura RSX Manual
- Compatible with 2002-2005 Civic Si
- 70A polyurethane construction
- Reduces engine movement
- Improves shifting feel
- Better power transfer
- Direct bolt-on installation
Cons
- Increased vibration compared to stock
- Manual transmission only
- Professional installation recommended
- Not as comfortable as factory rubber mounts
Frequently Asked Questions
Will this fit an RSX Type-S?
Yes. It is compatible with manual transmission RSX models, including the Type-S.
What does 70A polyurethane feel like?
70A is generally considered a street-friendly performance compound that balances comfort and stiffness.
Will it add horsepower?
No. It doesn’t increase engine output, but it can improve how efficiently power is transferred to the drivetrain.
Will I feel more vibration?
Yes. Some increase in cabin vibration is normal when upgrading from factory rubber mounts.
Final Thoughts
The 70A Polyurethane Front Right Engine Mount for the Acura RSX and Civic Si is one of the best bang-for-the-buck drivetrain upgrades available for K-Series enthusiasts. By reducing engine movement, improving shift feel, and enhancing power delivery, it helps unlock a more connected driving experience while remaining practical enough for daily use.
Because the only thing that should be moving during a hard pull is the tach needle—not the entire engine.
Easy Installation: Direct bolt-on replacement formanual transmission motor mount, no modifications needed
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