Designed specifically for the Acura RSX DC5 automatic drivetrain configuration, the Innovative Mounts 90641 replaces the factory rubber mounting assembly with a durable steel mount featuring a high-performance polyurethane bushing.

Factory Honda and Acura engine mounts are designed to isolate engine vibration and maintain passenger comfort. However, the original rubber and fluid-dampened components can deteriorate over time, allowing excessive engine movement during acceleration, deceleration, and gear changes.

The Innovative Mounts 90641 provides increased resistance to drivetrain movement, helping maintain more consistent engine and transmission positioning under load. Its performance polyurethane construction can also help reduce excessive engine rocking, improve drivetrain responsiveness, and minimize unwanted movement during aggressive acceleration.

Featuring durable steel construction, CAD/CAM-engineered mounting geometry, stress-analyzed components, and Innovative Mounts' no-tear polyurethane bushing design, the 90641 is an excellent upgrade for daily-driven Acura RSX vehicles, modified K-Series engines, and performance-oriented automatic transmission applications.

The direct-replacement design allows installation in the factory front mounting location without requiring hood trimming or notching.

Important: Part number 90641 is an individual front engine mount designed specifically for automatic-transmission Acura RSX applications. It is not compatible with manual-transmission RSX models and is not a complete engine mount kit.

Features

• Direct-Replacement Design: Replaces the factory front engine mount on compatible 2002–2006 Acura RSX automatic models.

• Acura RSX DC5 Compatibility: Engineered specifically for the second-generation Acura RSX chassis.

• Automatic Transmission Application: Designed for the factory automatic drivetrain mounting configuration.

• Honda K-Series Engine Compatibility: Supports compatible factory K20 engine applications.

• Front Mounting Position: Replaces the original front engine mount.

• Durable Steel Construction: Provides a strong mounting assembly for performance applications.

• Powder-Coated Finish: Helps protect the steel mount against corrosion.

• Performance Polyurethane Bushing: Provides increased resistance to drivetrain movement compared with conventional rubber mounts.

• No-Tear Bushing Design: Engineered to control excessive engine movement while retaining some vibration isolation.

• CAD/CAM Engineered: Developed for accurate fitment and consistent mounting geometry.

• Stress-Analyzed Components: Designed for demanding drivetrain applications.

• Improved Drivetrain Stability: Helps control unwanted engine movement during acceleration and deceleration.

• Reduced Mount Deflection: Maintains more consistent drivetrain positioning under load.

• Improved Drivetrain Response: Firmer mounting can provide a more connected acceleration feel.

• Potential Wheel Hop Reduction: Reduced drivetrain movement may help minimize wheel hop during hard acceleration.

• Multiple Bushing Hardness Options: Available in 75A, 85A, and 95A polyurethane configurations.

• No Hood Modifications Required: Direct-replacement installation does not require hood notching or trimming.

• Individual Replacement Mount: Allows upgrading the front mount without purchasing a complete engine mount kit.

• Lifetime Warranty: Backed by Innovative Mounts' lifetime warranty, subject to manufacturer terms.

Popular Performance Applications

Acura RSX Base Automatic Performance Builds

Provides firmer front engine mounting for automatic-transmission RSX Base models equipped with Honda K-Series engines.

Daily-Driven Acura RSX Upgrades

An excellent replacement for deteriorated factory mounts, helping improve drivetrain stability while maintaining the original mounting configuration.

Naturally Aspirated K20A3 Builds

Suitable for compatible K20A3 engines equipped with upgraded intake systems, exhaust components, and other performance modifications.

Modified Automatic K-Series Applications

Helps control excessive drivetrain movement in properly configured performance applications.

Street Performance Builds

The 75A bushing option offers improved drivetrain rigidity while retaining some vibration isolation for street-oriented vehicles.

Aggressive Driving Applications

Firmer polyurethane bushings help reduce excessive engine movement during rapid acceleration and throttle transitions.

Worn Factory Mount Replacement

An excellent upgrade when the original rubber or fluid-dampened front engine mount has deteriorated, cracked, or begun allowing excessive engine movement.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: 90641
• Product Type: Front Engine Mount
• Mounting Position: Front
• Vehicle Application: 2002–2006 Acura RSX Base
• Chassis Compatibility: DC5
• Engine Compatibility: Honda K20A3 / Compatible K-Series
• Transmission Compatibility: Automatic Only
• Factory Transmission: 5-Speed Automatic
• Mount Construction: Steel
• Finish: Black Powder Coat
• Bushing Material: Performance Polyurethane
• Available Bushing Hardness Options: 75A / 85A / 95A
• Engineering: CAD/CAM Designed and Stress Analyzed
• Installation Type: Direct Replacement
• Hood Modifications: Not Required
• Manufacturer-Listed Weight: Approximately 6 lbs
• Warranty: Manufacturer Lifetime Warranty, Subject to Terms

Available Polyurethane Bushing Hardness Options

75A – Black – Street / Performance

The softest available bushing option for the 90641.

Recommended for daily-driven and performance-oriented street vehicles where improved drivetrain stability is desired while retaining some vibration isolation.

Manufacturer horsepower guidance: approximately 250–400 HP.

85A – Grey – Performance / Race

Provides increased drivetrain rigidity for modified engines, aggressive driving, and performance applications.

Manufacturer horsepower guidance: approximately 400–500 HP.

95A – Red – Extreme Race

The stiffest available polyurethane option, intended for high-output engines and dedicated racing applications.

Manufacturer horsepower guidance: 500+ HP.

These horsepower ranges are general manufacturer selection guidelines rather than guaranteed load ratings. They do not establish a minimum horsepower requirement.

Important: Increasing bushing hardness generally increases noise, vibration, and harshness transmitted into the vehicle cabin. The 75A option is typically the most appropriate starting point for a street-driven automatic RSX.

Innovative Mounts 90640 vs. 90641

Innovative Mounts 90640: Steel front engine mount designed for compatible Honda Civic Si, Acura RSX, and Acura CSX applications equipped with manual transmissions.

Innovative Mounts 90641: Steel front engine mount designed specifically for 2002–2006 Acura RSX Base applications equipped with automatic transmissions.

Although both mounts serve the front engine mounting position, they are designed for different drivetrain configurations and should not be considered interchangeable.

Common Reasons for Replacement

• Cracked Factory Rubber: Aging rubber can deteriorate and allow excessive engine movement.

• Leaking Factory Mount: Fluid-filled factory mounts can lose their damping effectiveness when damaged.

• Separated Mount Bushing: Worn factory mounts may develop excessive movement under load.

• Excessive Engine Rocking: Firmer polyurethane helps control unwanted drivetrain movement.

• Clunking During Acceleration: A worn front engine mount may allow excessive movement that results in noticeable drivetrain noise.

• Clunking During Gear Changes: Excessive drivetrain movement can contribute to noticeable movement as the automatic transmission changes gears.

• Reduced Drivetrain Stability: Performance polyurethane helps maintain more consistent engine positioning.

• Performance Engine Upgrades: Modified K-Series engines can benefit from firmer drivetrain mounting.

• Individual Mount Replacement: Allows replacement of the front mount without purchasing a complete engine mount kit.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a 2002–2006 Acura RSX Base equipped with an automatic transmission.

2. Confirm Transmission Type: Verify that the vehicle retains a compatible automatic transmission. This mount is not intended for manual transmission applications.

3. Verify Mounting Position: The 90641 replaces the factory front engine mount.

4. Inspect the Existing Mount: Check the original mount for cracked rubber, fluid leakage, separation, corrosion, or excessive movement.

5. Support the Drivetrain: Properly support the engine and transmission before removing the factory front mount.

6. Remove the Factory Mount: Follow the applicable Acura RSX factory service procedures.

7. Inspect Mounting Locations: Check the chassis, subframe, and mounting brackets for damage or corrosion.

8. Position the Innovative Mounts 90641: Install the replacement mount in the factory front mounting location.

9. Verify Mount Alignment: Ensure the mount and surrounding brackets are properly aligned without excessive preload or binding.

10. Install the Required Hardware: Reuse applicable factory hardware or replacement fasteners specified by Innovative Mounts.

11. Torque Mounting Fasteners: Follow the Acura factory service manual and Innovative Mounts installation instructions.

12. Inspect Drivetrain Clearance: Verify that the engine and transmission do not contact surrounding chassis components.

13. Check for Additional Vibration: Some increase in vibration is normal when upgrading from factory rubber or fluid-filled mounts to performance polyurethane.

14. Perform a Final Inspection: Verify proper mounting alignment and secure hardware before operating the vehicle.

15. Recheck After Initial Use: Inspect the mount and mounting hardware after the initial driving period.

Important: Innovative Mounts advises that mounts showing bolt impressions from installation cannot be returned or exchanged. Confirm fitment before installation.

Professional installation is recommended.

What's Included

The Innovative Mounts 90641 includes:

• 1 × Innovative Mounts 90641 Steel Front Engine Mount Assembly

• 1 × Performance Polyurethane Bushing in the selected hardness configuration

Additional Information

This listing is for the individual front engine mount only.

The following components are not included unless separately specified:

• Driver-side transmission mount

• Passenger-side engine mount

• Rear engine mount

• Complete engine mount replacement kit

• Engine or transmission components

• Additional mounting hardware not specified by the manufacturer

Verify any required mounting hardware against the manufacturer packaging and installation instructions.

Upgrade your Acura RSX with the Innovative Mounts 90641 Steel Front Engine Mount, engineered specifically for 2002–2006 Acura RSX Base DC5 applications equipped with Honda K-Series engines and automatic transmissions.

Featuring durable steel construction, a protective powder-coated finish, CAD/CAM engineering, stress-analyzed components, and performance polyurethane bushings, the 90641 provides improved drivetrain stability and reduced excessive engine movement compared with worn factory rubber mounts.

Whether you're replacing a deteriorated OEM mount, upgrading a daily-driven automatic RSX, or building a modified K20A3 performance vehicle, Innovative Mounts delivers a dependable direct-replacement mounting solution.