Upgrade your K-Series drivetrain with the Innovative Mounts B90650 Billet Aluminum Engine & Transmission Mount Kit, designed for 2002–2006 Acura RSX and 2002–2005 Honda Civic Si EP3 applications equipped with compatible K-Series engines and factory-style manual transmissions.

The Innovative Mounts B90650 replaces the factory engine and transmission mounting components with precision-machined billet aluminum mounts featuring performance polyurethane bushings. Engineered to reduce excessive drivetrain movement, this kit provides improved engine stability, more consistent drivetrain positioning, and a premium engine bay appearance.

Factory Honda and Acura engine mounts are designed to balance drivetrain support with passenger comfort. Over time, the original rubber and hydraulic mounting components can deteriorate, crack, or separate, allowing increased engine and transmission movement during acceleration, deceleration, and shifting.

Excessive drivetrain movement can contribute to wheel hop, drivetrain clunking, and inconsistent shifting feel, particularly in vehicles equipped with performance modifications, upgraded clutches, or higher-output engines.

The Innovative Mounts B90650 addresses these concerns with a complete performance mounting solution designed to maintain proper drivetrain positioning while reducing unwanted engine movement.

Unlike conventional steel replacement mounts, the B90650 features billet aluminum construction, offering a durable, lightweight alternative with a distinctive machined appearance.

The kit utilizes Innovative Mounts' performance polyurethane bushing design to help maintain consistent engine and transmission positioning under load while retaining some vibration isolation.

Available with multiple bushing hardness options, the B90650 is suitable for daily-driven performance vehicles, naturally aspirated K20 builds, turbocharged applications, autocross, road racing, and dedicated motorsport projects.

Important: The B90650 is designed for compatible manual transmission applications. Vehicles originally equipped with an automatic transmission require a different mounting configuration, such as the Innovative Mounts B90651.

Features

• 2002–2006 Acura RSX Compatibility: Designed for compatible DC5 chassis equipped with manual transmissions.

• 2002–2005 Honda Civic Si Compatibility: Supports compatible EP3 chassis applications.

• K-Series Engine Compatibility: Designed for supported Honda K-Series engine configurations.

• Manual Transmission Application: Engineered for factory-style K-Series manual transmission mounting arrangements.

• Billet Aluminum Construction: Provides a durable, lightweight mounting solution with a premium machined appearance.

• Complete Performance Mounting System: Replaces the primary engine and transmission mounting components.

• Performance Polyurethane Bushings: Help reduce excessive drivetrain movement compared with conventional factory rubber mounts.

• No-Tear Bushing Design: Engineered to resist unwanted mount deflection while providing vibration isolation.

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

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

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

• Improved Shifting Consistency: Helps limit drivetrain movement that can affect shifting feel.

• CAD/CAM Engineered: Designed for consistent mounting geometry and component fitment.

• Stress-Analyzed Components: Developed for demanding performance applications.

• Multiple Bushing Hardness Options: Allows selection based on street or competition use.

• Premium Engine Bay Appearance: Billet aluminum construction complements performance engine bay upgrades.

• Steel Alternative Available: Innovative Mounts 90650.

• Performance Street and Track Applications: Suitable for naturally aspirated and forced-induction builds.

Popular Performance Applications

Acura RSX Engine Mount Replacement

Replaces aging factory engine and transmission mounts with billet aluminum performance components.

Honda Civic Si EP3 Performance Builds

Provides improved drivetrain mounting rigidity for compatible EP3 applications.

Naturally Aspirated K20 Builds

Suitable for K20 engines equipped with performance intake manifolds, headers, camshafts, and other upgrades.

Turbocharged K-Series Applications

Helps control excessive drivetrain movement in properly configured forced-induction builds.

Daily-Driven Performance Vehicles

Softer polyurethane bushing configurations can provide improved drivetrain stability while retaining some vibration isolation.

Autocross and Road Racing

Reduced mount deflection helps maintain more consistent drivetrain positioning during acceleration, braking, and cornering.

Drag Racing Applications

Firmer mounting helps resist excessive drivetrain movement during aggressive launches.

Engine Bay Appearance Upgrades

Billet aluminum construction provides a premium alternative to conventional factory mounting components.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: B90650
• Product Type: Billet Aluminum Engine & Transmission Replacement Mount Kit
• Vehicle Application: 2002–2006 Acura RSX / 2002–2005 Honda Civic Si
• Chassis Compatibility: DC5 / EP3
• Engine Compatibility: Compatible Honda K-Series
• Transmission Compatibility: Factory-Style K-Series Manual
• Mount Construction: Billet Aluminum
• Bushing Material: Performance Polyurethane
• Installation Type: Replacement Engine & Transmission Mount Kit
• Steel Alternative: Innovative Mounts 90650
• Automatic Transmission Alternative: Innovative Mounts B90651, Subject to Vehicle Compatibility

Polyurethane Bushing Selection

Innovative Mounts performance mounting systems are available with different polyurethane bushing hardness options. Confirm the available B90650 configurations when selecting the kit.

60A – Street

A softer performance bushing option intended to improve drivetrain stability while limiting additional vibration.

75A – Performance Street

A firmer option for modified street vehicles and occasional track use.

85A – Race

Designed for applications where increased drivetrain rigidity is preferred over passenger comfort.

95A – Extreme Race

A very firm polyurethane configuration intended for aggressive motorsport use.

Important: Increasing bushing hardness generally increases noise, vibration, and harshness transmitted into the passenger cabin. Select the appropriate configuration based on vehicle use and acceptable vibration levels.

Innovative Mounts B90650 vs. 90650

Innovative Mounts B90650 – Billet Aluminum

• Billet aluminum mounting components

• Performance polyurethane bushings

• Premium machined appearance

• Designed for compatible RSX and EP3 manual transmission applications

Innovative Mounts 90650 – Steel

• Steel mounting components

• Performance polyurethane bushings

• Designed for the same general manual transmission applications

• Conventional performance mount appearance

Innovative Mounts B90650 vs. B90651

Innovative Mounts B90650 – Manual Transmission

Designed for compatible Acura RSX and Honda Civic Si applications using factory-style K-Series manual transmission mounting arrangements.

Innovative Mounts B90651 – Automatic Transmission

Designed for compatible Acura RSX automatic transmission applications.

Important: These kits use different transmission mounting configurations and should not be treated as interchangeable.

Common Reasons for Replacement or Upgrade

• Worn Factory Rubber Mounts: Aging mounts can crack, separate, or allow excessive drivetrain movement.

• Leaking Hydraulic Mounts: Factory fluid-filled mounts can lose effectiveness when damaged.

• Excessive Engine Movement: Performance polyurethane helps reduce unwanted engine rocking.

• Drivetrain Clunking: Worn mounts can contribute to noise during acceleration and shifting.

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

• Inconsistent Shifting Feel: Reduced drivetrain movement helps maintain more consistent transmission positioning.

• Increased Performance Demands: Modified engines may benefit from firmer drivetrain mounting.

• Billet Aluminum Appearance: Provides a premium engine bay upgrade.

• Track and Competition Use: Firmer mounting helps control drivetrain movement during aggressive driving.

• Complete Mounting System Upgrade: Replaces the primary engine and transmission mounting positions.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a supported 2002–2006 Acura RSX or 2002–2005 Honda Civic Si EP3.

2. Confirm Transmission Compatibility: Verify that the vehicle uses the required factory-style K-Series manual transmission mounting arrangement.

3. Inspect Factory Mounts: Check for cracked rubber, separated components, leaking hydraulic fluid where applicable, or excessive drivetrain movement.

4. Prepare the Vehicle: Park on a level surface and safely support the vehicle using appropriate equipment.

5. Support the Engine and Transmission: Properly support the drivetrain before removing factory mounting components.

6. Remove the Factory Mounts: Follow the appropriate Honda or Acura service procedures.

7. Inspect Mounting Surfaces: Check the chassis, engine-side brackets, and transmission mounting points for damage, corrosion, or deformation.

8. Install the Innovative Mounts B90650 Components: Position each mount according to the manufacturer's installation instructions.

9. Verify Drivetrain Alignment: Ensure all mounting points align correctly without excessive preload or binding.

10. Install the Required Hardware: Use the fasteners specified in the manufacturer's installation instructions.

11. Torque All Fasteners: Follow Innovative Mounts' instructions and applicable Honda or Acura service procedures.

12. Inspect Engine Bay Clearance: Verify adequate clearance around the engine, transmission, accessories, cooling system, and surrounding components.

13. Check for Additional Vibration: Some increase in noise, vibration, and harshness is normal when installing performance polyurethane engine mounts.

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

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

Professional installation by an experienced Honda or Acura technician is recommended.

What's Included

The Innovative Mounts B90650 Billet Aluminum Engine & Transmission Mount Kit includes the billet aluminum drivetrain mounting components supplied by Innovative Mounts for the specified manual transmission application.

• Billet aluminum engine and transmission mounting components

• Performance polyurethane bushings in the selected configuration

• Manufacturer-supplied hardware, where applicable

Important: Verify the exact individual mount part numbers and hardware package against the current manufacturer listing before publishing a component-level inventory.

Components Not Included Unless Otherwise Specified

• Engine

• Transmission

• Engine-side brackets not supplied with the kit

• Clutch and flywheel components

• Axles and intermediate shaft

• Additional drivetrain conversion components

Upgrade your Acura RSX or Honda Civic Si EP3 with the Innovative Mounts B90650 Billet Aluminum Engine & Transmission Mount Kit, designed for compatible 2002–2006 Acura RSX DC5 and 2002–2005 Honda Civic Si EP3 applications equipped with K-Series engines and manual transmissions.

Featuring billet aluminum construction, performance polyurethane bushings, and a purpose-built factory-style mounting configuration, the B90650 provides improved drivetrain stability and a premium alternative to aging factory engine mounts.

Whether you're replacing worn factory mounts, upgrading a naturally aspirated K20 engine, or building a turbocharged performance vehicle, Innovative Mounts delivers a durable and performance-oriented mounting solution.