Upgrade your eighth-generation Honda Civic Si with the Innovative Mounts 90850 Steel Engine & Transmission Mount Kit, engineered for 2006–2011 Honda Civic Si models equipped with K-Series engines and manual transmissions.

Designed as a direct replacement for the factory engine and transmission mounting system, the Innovative Mounts 90850 provides improved drivetrain stability, reduced excessive engine movement, and increased mounting rigidity compared with conventional OEM rubber mounts.

The 2006–2011 Honda Civic Si features Honda's high-revving K20Z3 engine paired with a six-speed manual transmission. While the factory mounting system provides excellent comfort for everyday driving, the original rubber and fluid-filled mounts can deteriorate over time or allow excessive drivetrain movement during aggressive acceleration, shifting, and performance driving.

This unwanted movement can contribute to wheel hop, drivetrain clunking, inconsistent throttle response, and increased stress on surrounding components.

The Innovative Mounts 90850 addresses these concerns with a complete four-mount steel replacement system featuring three additional mounting brackets and performance polyurethane bushings.

Unlike conventional factory rubber mounts, Innovative Mounts' polyurethane bushings are engineered to resist excessive engine movement while retaining some vibration isolation. This helps maintain more consistent drivetrain positioning during acceleration, deceleration, and gear changes.

Featuring CAD/CAM-engineered components, stress-analyzed construction, and Innovative Mounts' no-tear polyurethane bushing design, the 90850 is an excellent upgrade for daily-driven Civic Si models, naturally aspirated K20 builds, supercharged and turbocharged applications, and dedicated motorsport vehicles.

Important: The Innovative Mounts 90850 is a direct-replacement engine and transmission mount kit for compatible 2006–2011 Honda Civic Si K-Series manual-transmission applications. It is not an automatic-transmission conversion kit.

Features

• 2006–2011 Honda Civic Si Compatibility: Designed for eighth-generation Civic Si models.

• FA5 and FG2 Chassis Fitment: Supports compatible sedan and coupe applications.

• K-Series Engine Compatibility: Designed for factory K20 and compatible K-Series engine configurations.

• Manual Transmission Application: Intended for compatible K-Series manual transmission setups.

• Complete Four-Mount Replacement Kit: Includes driver-side, passenger-side, front, and rear mounting components.

• Three Mounting Brackets Included: Provides the additional brackets required for the replacement mounting arrangement.

• Direct Bolt-On Installation: Designed to replace the factory mounts without chassis cutting or modification.

• No Hood Modification Required: Does not require notching or trimming the hood.

• Durable Steel Construction: Built for demanding street and performance applications.

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

• No-Tear Bushing Design: Engineered to resist unwanted drivetrain movement while maintaining some vibration isolation.

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

• Stress-Analyzed Components: Developed for demanding drivetrain loads.

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

• Reduced Mount Deflection: Maintains more consistent engine and transmission positioning under load.

• Improved Driving Response: Firmer mounting provides a more connected drivetrain feel.

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

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

• Installation Hardware Included: Supplied with the manufacturer's specified mounting hardware.

• Street and Racing Applications: Suitable for properly configured daily-driven, autocross, road racing, and drag racing vehicles.

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

Popular Performance Applications

2006–2011 Honda Civic Si Performance Builds

The primary application for the Innovative Mounts 90850. Replaces the factory engine and transmission mounting system with firmer performance-oriented components.

Naturally Aspirated K20Z3 Builds

Suitable for Civic Si models equipped with performance intake manifolds, headers, camshafts, exhaust systems, and other naturally aspirated upgrades.

Supercharged Honda Civic Si Applications

Provides increased drivetrain mounting rigidity for properly configured supercharged K20Z3 engines.

Turbocharged K-Series Applications

Helps control excessive engine movement in compatible turbocharged Civic Si builds.

K20/K24 Hybrid Engine Builds

May be suitable for properly configured K24-based hybrid engines retaining compatible K-Series manual transmission mounting provisions.

Daily-Driven Performance Vehicles

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

Autocross and Road Racing

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

Drag Racing Applications

Firmer polyurethane bushings help resist excessive engine movement during aggressive launches.

Worn Factory Engine Mount Replacement

An excellent upgrade when original rubber mounts have deteriorated, separated, or begun allowing excessive movement under load.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: 90850
• Product Type: Steel Engine & Transmission Mount Kit
• Vehicle Application: 2006–2011 Honda Civic Si
• Chassis Compatibility: FA5 / FG2 / Select FD2 and FN2 Applications
• Engine Compatibility: Honda K-Series
• Factory Engine: Honda K20Z3
• Transmission Compatibility: Compatible K-Series Manual Transmission
• Mount Construction: Steel
• Bushing Material: Performance Polyurethane
• Available Bushing Hardness Options: 75A / 85A / 95A
• Mounting Configuration: Four Mounts and Three Mounting Brackets
• Driver-Side Transmission Mount: Innovative Mounts 90010
• Driver-Side Mounting Bracket: Innovative Mounts 90810-SB
• Passenger-Side Engine Mount: Innovative Mounts 90120
• Passenger-Side Mounting Bracket: Innovative Mounts 90820-SB
• Rear Engine Mount: Innovative Mounts 91430
• Rear Mounting Bracket: Innovative Mounts 90830-SB
• Front Engine Mount: Innovative Mounts 90640
• Engineering: CAD/CAM Designed and Stress Analyzed
• Installation Type: Direct Bolt-On Replacement
• Mounting Hardware: Included
• Replacement Hardware Kit: Innovative Mounts 90850-HW
• Manufacturer-Listed Weight: Approximately 25 lbs
• Warranty: Manufacturer Lifetime Warranty, Subject to Terms

Available Polyurethane Bushing Hardness Options

75A – Black – Street / Performance

The softest available bushing option for the 90850.

Recommended for daily-driven and performance-oriented Honda Civic Si applications 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 competition 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 bushing selection guidelines rather than guaranteed load ratings or minimum horsepower requirements.

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 Civic Si.

Honda OEM Engine Mount Cross-References

The Innovative Mounts 90850 is designed to replace the factory mounting components associated with the following Honda OEM part numbers:

Honda 50890-SVB-A02

Factory rear engine mounting component.

Honda 50690-SVB-A00

Factory rear mounting component.

Honda 50850-SVB-A03

Factory driver-side transmission mounting component.

Honda 50830-SVB-A01

Factory front engine mounting component.

Honda 50820-SNG-J02

Factory passenger-side engine mounting component.

Important: These OEM part numbers are manufacturer-listed cross-references for the replacement mounting system. Verify exact fitment using the vehicle's original mounting configuration.

Innovative Mounts 90850 vs. Individual Replacement Mounts

Innovative Mounts 90850 – Complete Engine & Transmission Mount Kit

Includes all four primary mounts and three mounting brackets required for the supported replacement configuration.

Innovative Mounts 90010 – Driver-Side Transmission Mount

Individual driver-side mounting component.

Innovative Mounts 90120 – Passenger-Side Engine Mount

Individual passenger-side mounting component.

Innovative Mounts 91430 – Rear Engine Mount

Individual rear mounting component used in the complete kit.

Innovative Mounts 90640 – Front Engine Mount

Individual front engine mounting component.

Important: Individual mounts may require additional brackets or hardware. The 90850 provides a coordinated replacement mounting system.

Common Reasons for Replacement or Upgrade

• Worn Factory Rubber Mounts: Aging rubber mounts can deteriorate and allow excessive engine movement.

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

• Excessive Engine Movement: Firmer polyurethane helps control unwanted drivetrain rocking.

• Wheel Hop During Acceleration: Excessive drivetrain movement can contribute to wheel hop in certain driving conditions.

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

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

• Performance Engine Upgrades: Modified K20 and compatible K24 engines can benefit from firmer mounting.

• Supercharged or Turbocharged Applications: Provides increased mount rigidity for properly configured forced-induction builds.

• Track and Racing Applications: Offers improved drivetrain stability for demanding driving conditions.

• Preventive Maintenance: Replaces aging factory mounting components before excessive deterioration occurs.

• Complete Engine Mount Upgrade: Replaces all four primary mounting positions with a coordinated system.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a compatible 2006–2011 Honda Civic Si equipped with a supported K-Series engine and manual transmission.

2. Inspect the Existing Mounts: Check the factory engine and transmission mounts for cracked rubber, leaking hydraulic fluid, separation, or excessive movement.

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

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

5. Remove the Factory Mounts: Follow the appropriate Honda Civic Si factory service procedures.

6. Inspect Mounting Locations: Check the chassis mounting points, engine brackets, and transmission mounting surfaces for damage or corrosion.

7. Install the Driver-Side Transmission Mount: Position the Innovative Mounts 90010 according to the manufacturer's instructions.

8. Install the Driver-Side Bracket: Install the Innovative Mounts 90810-SB mounting bracket.

9. Install the Passenger-Side Engine Mount: Position the Innovative Mounts 90120 passenger-side mounting component.

10. Install the Passenger-Side Bracket: Install the Innovative Mounts 90820-SB mounting bracket.

11. Install the Rear Engine Mount: Position the Innovative Mounts 91430 rear mounting component.

12. Install the Rear Mounting Bracket: Install the Innovative Mounts 90830-SB bracket.

13. Install the Front Engine Mount: Position the Innovative Mounts 90640 front mounting component.

14. Verify Drivetrain Alignment: Ensure the engine and transmission are properly positioned without excessive mount preload or binding.

15. Install the Required Hardware: Use the mounting hardware supplied by Innovative Mounts and any factory hardware specified in the installation instructions.

16. Torque Mounting Fasteners: Follow the manufacturer's installation instructions and applicable Honda service procedures.

17. Inspect Engine Bay Clearance: Verify clearance around the engine, transmission, chassis, radiator, exhaust, and surrounding components.

18. Check for Additional Vibration: Some increase in noise, vibration, and harshness is normal when upgrading from factory rubber mounts to performance polyurethane.

19. Perform a Final Inspection: Verify mounting alignment, fastener security, and drivetrain clearance before operating the vehicle.

20. Recheck After Initial Use: Inspect the engine mounts 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 by an experienced mechanic or performance specialist is recommended.

What's Included

The Innovative Mounts 90850 engine and transmission mount kit includes:

• 1 × Innovative Mounts 90010 Driver-Side Transmission Mount

• 1 × Innovative Mounts 90810-SB Driver-Side Mounting Bracket

• 1 × Innovative Mounts 90120 Passenger-Side Engine Mount

• 1 × Innovative Mounts 90820-SB Passenger-Side Mounting Bracket

• 1 × Innovative Mounts 91430 Rear Engine Mount

• 1 × Innovative Mounts 90830-SB Rear Mounting Bracket

• 1 × Innovative Mounts 90640 Front Engine Mount

• Performance polyurethane bushings in the selected hardness configuration

• Manufacturer-supplied installation hardware

Additional Information

This listing is for the complete engine and transmission mount replacement system.

The following components are not included unless separately specified:

• Engine

• Transmission

• Clutch and flywheel components

• Axles and intermediate shaft

• Engine wiring harness

• Additional drivetrain components outside the mounting system

Replacement mounting hardware is available separately under Innovative Mounts part number 90850-HW.

Upgrade your eighth-generation Honda Civic Si with the Innovative Mounts 90850 Steel Engine & Transmission Mount Kit, engineered specifically for 2006–2011 Honda Civic Si K-Series manual-transmission applications.

Featuring durable steel construction, four primary engine and transmission mounts, three mounting brackets, CAD/CAM engineering, stress-analyzed components, and performance polyurethane bushings, the 90850 provides improved drivetrain stability and reduced excessive engine movement compared with worn factory rubber mounts.

Whether you're replacing deteriorated OEM mounts, upgrading a daily-driven Civic Si, or preparing a naturally aspirated, supercharged, or turbocharged K-Series performance build, Innovative Mounts delivers a dependable drivetrain mounting solution.