Designed as a direct replacement for the factory engine and transmission mounting system, the Innovative Mounts 91250 provides improved drivetrain stability, reduced excessive engine movement, and increased mounting rigidity compared with conventional OEM rubber and hydraulic mounts.

The 2012–2015 Honda Civic Si features Honda's 2.4L K24Z7 DOHC i-VTEC engine, delivering strong midrange torque and excellent performance potential. While the factory engine mounts are designed to balance comfort and drivetrain control, they can deteriorate over time or allow excessive movement during aggressive acceleration, shifting, and spirited driving.

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

The Innovative Mounts 91250 addresses these concerns with a purpose-built steel mounting system consisting of three primary engine and transmission mounts and three corresponding mounting brackets.

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

Featuring CAD/CAM-engineered components, stress-analyzed construction, and Innovative Mounts' no-tear polyurethane bushing design, the 91250 is an excellent upgrade for daily-driven Civic Si models, naturally aspirated K24Z7 builds, supercharged and turbocharged applications, and dedicated motorsport vehicles.

Important: The Innovative Mounts 91250 is designed for compatible 2012–2015 Honda Civic Si FB6/FG4 applications with K-Series engines and manual transmissions. It is not an automatic-transmission conversion kit or a universal K-Series swap mount kit.

Features

• 2012–2015 Honda Civic Si Compatibility: Designed specifically for ninth-generation Civic Si applications.

• FB6 and FG4 Chassis Fitment: Supports compatible sedan and coupe models.

• K24Z7 Engine Application: Designed around the factory 2.4L K-Series drivetrain.

• Manual Transmission Compatibility: Intended for compatible K-Series manual transmission configurations.

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

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

• Direct Bolt-On Replacement: Designed to replace the factory mounting system without chassis cutting or fabrication.

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

• Durable Steel Construction: Provides a strong mounting solution for demanding street and performance applications.

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

• No-Tear Bushing Design: Engineered to resist unwanted engine 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

2012–2015 Honda Civic Si Performance Builds

The primary application for the Innovative Mounts 91250. Replaces the factory engine and transmission mounting system with firmer performance-oriented components.

Naturally Aspirated K24Z7 Builds

Suitable for Civic Si models equipped with performance intake systems, headers, exhaust components, engine tuning, and other naturally aspirated upgrades.

Supercharged Honda Civic Si Applications

Provides increased drivetrain mounting rigidity for properly configured supercharged K24Z7 engines.

Turbocharged K24Z7 Applications

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

Daily-Driven Performance Vehicles

The 75A bushing option provides 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 or hydraulic mounts have deteriorated, separated, or begun allowing excessive movement under load.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: 91250
• Product Type: Steel Engine & Transmission Mount Kit
• Vehicle Application: 2012–2015 Honda Civic Si
• Chassis Compatibility: FB6 / FG4
• Factory Engine: Honda K24Z7
• Transmission Compatibility: Factory-Style K-Series Manual Transmission
• Drivetrain: Front-Wheel Drive
• Mount Construction: Steel
• Bushing Material: Performance Polyurethane
• Available Bushing Hardness Options: 75A / 85A / 95A
• Mounting Configuration: Three Primary Mounts and Three Mounting Brackets
• Driver-Side Transmission Mount: Innovative Mounts 90010
• Driver-Side Mounting Bracket: Innovative Mounts 91410-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 91430-SB
• Engineering: CAD/CAM Designed and Stress Analyzed
• Installation Type: Direct Replacement
• Mounting Hardware: Manufacturer-Supplied Hardware
• 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 91250.

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.

Innovative Mounts 91250 vs. B91250

Innovative Mounts 91250 – Steel Replacement Mount Kit

• Steel construction

• Designed for compatible 2012–2015 Civic Si applications

• Includes three primary mounts and three mounting brackets

• Performance polyurethane bushings

• Available in 75A, 85A, and 95A configurations

• Direct-replacement mounting design

Innovative Mounts B91250 – Billet Aluminum Replacement Mount Kit

• Billet aluminum construction

• Designed for compatible 2012–2015 Civic Si applications

• Performance polyurethane bushings

• Available in multiple bushing hardness configurations

• Different construction and supplied hardware arrangement

Important: Although both kits serve similar applications, their component designs and hardware requirements may differ. Verify the correct part number before ordering.

Innovative Mounts 90850 vs. 91250

Innovative Mounts 90850 – Eighth-Generation Civic Si

Designed for compatible 2006–2011 Honda Civic Si FA5/FG2 applications equipped with K-Series engines and manual transmissions.

Innovative Mounts 91250 – Ninth-Generation Civic Si

Designed for compatible 2012–2015 Honda Civic Si FB6/FG4 applications equipped with K-Series engines and manual transmissions.

Important: These kits are designed for different Civic generations and are not interchangeable.

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 K24Z7 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 the three primary mounting positions with a coordinated system.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a compatible 2012–2015 Honda Civic Si FB6 or FG4 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 91410-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 91430-SB bracket.

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

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

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

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

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

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

19. 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 91250 engine and transmission mount kit includes:

• 1 × Innovative Mounts 90010 Driver-Side Transmission Mount

• 1 × Innovative Mounts 91410-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 91430-SB Rear Mounting Bracket

• Performance polyurethane bushings in the selected hardness configuration

• Manufacturer-supplied installation hardware

Additional Information

This listing is for the 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

Verify the exact supplied hardware and components against the manufacturer packaging and installation instructions.

Upgrade your ninth-generation Honda Civic Si with the Innovative Mounts 91250 Steel Engine & Transmission Mount Kit, engineered specifically for 2012–2015 Honda Civic Si K24Z7 manual-transmission applications.

Featuring durable steel construction, three primary engine and transmission mounts, three mounting brackets, CAD/CAM engineering, stress-analyzed components, and performance polyurethane bushings, the 91250 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 K24Z7 performance build, Innovative Mounts delivers a dependable drivetrain mounting solution.