Designed for enthusiasts replacing their factory B-Series engine with a Honda K20 or properly configured K24 engine, the Innovative Mounts 99351 provides the specialized mounting components necessary to position and secure a compatible K-Series drivetrain within the Integra engine bay.

The second-generation Acura Integra is a popular platform among Honda and Acura performance enthusiasts thanks to its lightweight construction, responsive handling, and extensive aftermarket support. Combining this classic chassis with Honda's modern K-Series engine technology opens the door to increased horsepower, improved torque, and a wide range of naturally aspirated and forced-induction performance upgrades.

However, installing a K-Series engine into an older Integra requires specialized mounting components because the factory B-Series mounting arrangement is not compatible with the replacement drivetrain.

The Innovative Mounts 99351 addresses these requirements with a purpose-built steel conversion system consisting of three primary engine and transmission mounts and two specialized mounting brackets.

Designed for compatible vehicles originally equipped with either manual or automatic transmissions, the 99351 supports K-Series conversions using specified Honda and Acura K-Series manual transmissions.

The kit incorporates performance polyurethane bushings designed to reduce excessive drivetrain movement during acceleration, deceleration, and shifting. Compared with conventional factory rubber mounts, these firmer bushings help maintain more consistent engine and transmission positioning under load.

Featuring CAD/CAM-engineered components, stress-analyzed construction, and Innovative Mounts' no-tear polyurethane bushing design, the 99351 is an excellent mounting solution for naturally aspirated K20 builds, turbocharged K24 applications, autocross projects, drag racing vehicles, and dedicated motorsport builds.

Important: The Innovative Mounts 99351 is designed for 1990–1991 Acura Integra and 1992–1993 Acura Integra GS-R applications. It is not the correct kit for 1992–1993 non-GS-R Integra models, which require Innovative Mounts part number 99350.

Features

• 1990–1991 Acura Integra Compatibility: Designed for supported DA9 chassis applications.

• 1992–1993 Acura Integra GS-R Compatibility: Specifically engineered for the DB2 GS-R chassis.

• K-Series Engine Conversion: Supports compatible Honda K20 and properly configured K24 engine swaps.

• Manual and Auto-to-Manual Applications: Accommodates supported chassis originally equipped with manual or automatic transmissions.

• K-Series Manual Transmission Compatibility: Designed around specified Honda and Acura K-Series manual transmissions.

• Three-Mount Conversion System: Includes driver-side, passenger-side, and rear drivetrain mounting components.

• Two Conversion Mounting Brackets: Provides the specialized brackets required for the supported conversion.

• Durable Steel Construction: Designed for demanding street and motorsport applications.

• Weld-In Chassis Bracket: Includes a self-locating bracket that must be welded to the chassis.

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

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

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

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

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

• Reduced Mount Deflection: Maintains more consistent drivetrain 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.

• Street and Racing Applications: Suitable for properly configured street performance, autocross, road racing, and drag racing builds.

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

Popular Performance Applications

1990–1991 Acura Integra K20 Engine Swaps

Provides the specialized mounting components needed to install a compatible K20 engine into the DA9 chassis.

1992–1993 Acura Integra GS-R K20 Engine Swaps

Designed for converting the factory B17A1-powered DB2 GS-R chassis to a compatible K-Series drivetrain.

K24 Engine Conversions

Supports properly configured K24 installations using the required Honda 11910-PPA-000 mounting bracket and compatible K20-style manual transmission.

Naturally Aspirated K-Series Performance Builds

Suitable for engines equipped with upgraded intake manifolds, performance headers, camshafts, and other naturally aspirated modifications.

Turbocharged K20 and K24 Applications

Provides a performance-oriented mounting solution for properly configured forced-induction Integra builds.

Automatic-to-Manual K-Series Conversions

Accommodates supported original automatic chassis being converted to a compatible K-Series manual drivetrain.

Autocross and Road Racing

Performance polyurethane bushings help maintain more consistent drivetrain positioning during acceleration, braking, and cornering.

Drag Racing Applications

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

Dedicated Motorsport Builds

An excellent solution for custom Integra projects requiring a secure K-Series drivetrain mounting arrangement.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: 99351
• Product Type: Steel K-Series Engine Conversion Mount Kit
• Vehicle Application: 1990–1991 Acura Integra / 1992–1993 Acura Integra GS-R
• Chassis Compatibility: DA9 / DB2
• Original Engines: Honda B18A1 / B17A1
• Conversion Engine Compatibility: Honda K20-Series / Properly Configured K24-Series
• Transmission Compatibility: Specified K-Series Manual Transmissions
• Original Chassis Transmission: Manual or Automatic
• Mount Construction: Steel
• Bushing Material: Performance Polyurethane
• Available Bushing Hardness Options: 75A / 85A / 95A
• Mounting Configuration: Three Primary Mounts and Two Mounting Brackets
• Driver-Side Mount: Innovative Mounts 99310
• Passenger-Side Mount: Innovative Mounts 99320
• Passenger-Side Mounting Bracket: Innovative Mounts 99320-SB
• Rear Engine/Transmission Mount: Innovative Mounts 99330
• Rear Mounting Bracket: Innovative Mounts 99130-SB
• Installation Type: K-Series Engine Conversion with Required Welding
• Weld-In Bracket: Required
• K24 Engine Bracket Requirement: Honda 11910-PPA-000
• Recommended Competition Bar: Innovative Mounts 59311
• Engineering: CAD/CAM Designed and Stress Analyzed
• Manufacturer-Listed Weight: Approximately 15 lbs
• Warranty: Manufacturer Lifetime Warranty, Subject to Terms

Available Polyurethane Bushing Hardness Options

75A – Black – Street / Performance

The softest available bushing option for the 99351.

Recommended for street-oriented Integra conversions 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 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 Integra conversion.

Innovative Mounts 99350 vs. 99351

Innovative Mounts 99350 – 1992–1993 Integra Non-GS-R

Designed for compatible 1992–1993 Acura Integra RS, LS, and GS applications undergoing a K-Series engine conversion.

Innovative Mounts 99351 – 1990–1991 Integra / 1992–1993 Integra GS-R

Designed for 1990–1991 Acura Integra DA9 applications and 1992–1993 Acura Integra GS-R DB2 models undergoing a K-Series engine conversion.

Important: These kits are designed for different original chassis mounting arrangements and are not interchangeable.

K20 vs. K24 Installation Requirements

K20 Engine Installation

The Innovative Mounts 99351 is designed for compatible K20 engine conversions using the specified manual transmission mounting arrangement.

K24 Engine Installation

When installing a K24 engine, Innovative Mounts requires an additional Honda engine mounting bracket.

Honda Part Number: 11910-PPA-000

This bracket allows the passenger-side mounting component to attach to the supported K24 engine configuration.

The K24 must also be paired with a compatible K20-style manual transmission.

Important: K24 transmissions are not compatible with the specified 99351 mounting arrangement.

Required Welding and Chassis Preparation

The Innovative Mounts 99351 requires additional chassis preparation beyond a conventional engine mount replacement.

Weld-In Mounting Bracket

A self-locating bracket must be positioned and welded to the vehicle frame according to Innovative Mounts' installation instructions.

Chassis Inspection

Inspect the mounting area for corrosion, structural damage, or previous repairs before welding.

Drivetrain Positioning

Verify engine and transmission positioning before permanently securing the conversion components.

Important: Incorrect bracket placement or poor welding can affect drivetrain alignment and vehicle safety. Professional installation by an experienced fabrication shop is strongly recommended.

Recommended Supporting Components

Innovative Mounts 59311 – 1990–1993 Integra Competition Bar

Recommended by Innovative Mounts for compatible Integra performance applications.

Cable-to-Hydraulic Clutch Conversion Actuator

Recommended when converting the original cable-operated clutch system to a compatible hydraulic K-Series transmission.

These components are sold separately unless otherwise specified.

Additional Components Required for a K-Series Swap

The Innovative Mounts 99351 addresses the engine and transmission mounting portion of the conversion. Additional components are required to complete the swap.

Common supporting components include:

• Compatible Honda K20 or K24 engine

• Compatible K-Series manual transmission

• K-Series swap-compatible axles

• Compatible intermediate shaft

• Cable-to-hydraulic clutch conversion system

• Manual transmission shifter assembly

• Shifter cables and mounting components

• K-Series engine wiring harness

• Chassis conversion wiring harness

• Compatible ECU or aftermarket engine management system

• K-Series swap-compatible radiator and cooling system

• Appropriate radiator hoses

• Engine swap-compatible fuel delivery components

• K-Series swap-compatible exhaust header

• Exhaust system modifications

• Appropriate intake and throttle body components

• Required engine accessory modifications

• Additional fabrication and clearance modifications

Exact requirements depend on the selected engine, transmission, chassis configuration, and intended performance application.

Common Reasons for Replacement or Upgrade

• K-Series Engine Conversion: Provides specialized mounting components for installing a compatible K-Series drivetrain.

• Modern Honda Engine Performance: Enables the use of K20 and properly configured K24 engines in classic Integra platforms.

• Factory Mount Incompatibility: Addresses mounting differences between the original B-Series and replacement K-Series drivetrains.

• 1992–1993 GS-R Conversion Requirements: Provides the correct mounting configuration for the DB2 GS-R chassis.

• Automatic-to-Manual Conversion: Supports compatible original automatic chassis being converted to a manual drivetrain.

• Improved Drivetrain Stability: Performance polyurethane helps control excessive engine movement.

• Reduced Mount Deflection: Maintains more consistent drivetrain positioning during acceleration and shifting.

• Performance Engine Upgrades: Supports properly configured naturally aspirated and forced-induction K-Series builds.

• Track and Racing Applications: Provides increased mount rigidity for demanding driving conditions.

• Complete Conversion Mounting System: Includes three mounts and two mounting brackets for the supported application.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a 1990–1991 Acura Integra DA9 or 1992–1993 Acura Integra GS-R DB2.

2. Confirm Non-GS-R Exclusion: The 1992–1993 Integra non-GS-R requires Innovative Mounts part number 99350.

3. Confirm Engine Selection: Verify that the selected K20 or K24 engine is compatible with the kit.

4. Confirm Transmission Compatibility: Use a supported K-Series manual transmission from the specified Civic Si, RSX, or Integra applications.

5. Verify K24 Mounting Requirements: If installing a K24 engine, obtain the required Honda 11910-PPA-000 mounting bracket.

6. Prepare the Vehicle: Follow the appropriate service procedures for removing the original B-Series engine, transmission, and related components.

7. Support the Vehicle: Safely support the chassis using appropriate lifting equipment before beginning fabrication.

8. Inspect the Chassis: Check mounting areas, frame rails, and surrounding structural components for corrosion, cracks, or previous repairs.

9. Prepare the Weld-In Bracket Location: Identify and prepare the specified chassis mounting area according to the manufacturer's instructions.

10. Position the Self-Locating Bracket: Position the conversion bracket in the specified location and verify alignment.

11. Weld the Bracket to the Chassis: Have the bracket professionally welded using appropriate fabrication procedures.

12. Install the Driver-Side Mount: Position the Innovative Mounts 99310 according to the manufacturer's instructions.

13. Install the Passenger-Side Mount: Position the Innovative Mounts 99320 mounting component.

14. Install the Passenger-Side Bracket: Install the Innovative Mounts 99320-SB bracket.

15. Install the Rear Mount: Position the Innovative Mounts 99330 rear mounting component.

16. Install the Rear Mounting Bracket: Install the Innovative Mounts 99130-SB bracket.

17. Position the K-Series Drivetrain: Carefully lower the engine and transmission into the engine bay and align the mounting components.

18. Verify Drivetrain Alignment: Check engine positioning, transmission alignment, axle geometry, and clearance around surrounding chassis components.

19. Check Mount Preload: Ensure the mounts are properly aligned without excessive binding.

20. Install the Required Hardware: Use the mounting hardware specified by Innovative Mounts for the conversion.

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

22. Complete Supporting Modifications: Install the required axles, clutch system, shifter components, wiring, cooling system, fuel system, and exhaust components.

23. Inspect Engine Bay Clearance: Verify adequate clearance around the engine, transmission, steering system, suspension, radiator, exhaust, and hood.

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

25. Perform a Final Inspection: Verify weld quality, mounting alignment, hardware security, and drivetrain clearance before operating the vehicle.

26. Recheck After Initial Use: Inspect the mounting system and related 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 engine swap specialist or fabrication shop is strongly recommended.

What's Included

The Innovative Mounts 99351 K-Series engine conversion mount kit includes:

• 1 × Innovative Mounts 99310 Driver-Side Mount

• 1 × Innovative Mounts 99320 Passenger-Side Mount

• 1 × Innovative Mounts 99320-SB Passenger-Side Mounting Bracket

• 1 × Innovative Mounts 99330 Rear Engine/Transmission Mount

• 1 × Innovative Mounts 99130-SB Rear Mounting Bracket

• Performance polyurethane bushings in the selected hardness configuration

Additional Information

This listing is for the K-Series conversion mounting system designed for compatible 1990–1991 Acura Integra and 1992–1993 Acura Integra GS-R chassis.

The following components are not included unless separately specified:

• Honda K20 or K24 engine

• Manual transmission

• Honda 11910-PPA-000 K24 engine bracket

• Cable-to-hydraulic clutch conversion components

• Clutch and flywheel assembly

• K-Series swap axles and intermediate shaft

• Shifter assembly and cables

• Engine wiring harness or ECU

• Cooling system conversion components

• Fuel system conversion components

• Exhaust components

• Innovative Mounts 59311 Competition Bar

• Fabrication labor and additional chassis modifications

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

Transform your second-generation Acura Integra with the Innovative Mounts 99351 Steel K-Series Engine Conversion Mount Kit, engineered specifically for 1990–1991 Acura Integra DA9 and 1992–1993 Acura Integra GS-R DB2 chassis.

Featuring durable steel construction, three primary drivetrain mounts, two conversion mounting brackets, CAD/CAM engineering, stress-analyzed components, and performance polyurethane bushings, the 99351 provides the specialized mounting solution needed for a properly configured Honda K-Series engine swap.

Whether you're building a naturally aspirated K20-powered Integra, developing a turbocharged K24 performance project, or preparing a dedicated drag racing, autocross, or road racing vehicle, Innovative Mounts delivers a purpose-built drivetrain mounting solution.