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Product Details
Upgrade your Acura RSX with the Innovative Mounts 90651 Steel Replacement Engine Mount Kit, engineered for 2002–2006 Acura RSX Base models equipped with the factory Honda K-Series engine and automatic transmission.
Designed as a direct performance replacement for the factory engine and transmission mounts, the Innovative Mounts 90651 provides increased drivetrain stability, reduced excessive engine movement, and improved responsiveness compared with worn or deteriorated factory rubber mounts.
Factory Honda and Acura engine mounts are designed to absorb vibration and isolate the drivetrain from the vehicle chassis. Over time, the original rubber and fluid-filled damping components can crack, deteriorate, leak, or separate, allowing excessive engine movement during acceleration, deceleration, and automatic transmission gear changes.
The Innovative Mounts 90651 replaces the factory mounting components with durable steel assemblies featuring performance polyurethane bushings. These bushings are engineered to resist excessive drivetrain movement while retaining some vibration isolation for street and performance applications.
The kit includes the driver-side transmission mount, passenger-side engine mount, and rear engine mount, along with the appropriate passenger-side engine post mount. Together, these components provide a coordinated mounting upgrade for the automatic-transmission Acura RSX.
Featuring CAD/CAM-engineered mounting geometry, stress-analyzed components, and Innovative Mounts' no-tear polyurethane bushing design, the 90651 is an excellent choice for daily-driven RSX models, modified K20A3 engines, and performance-oriented automatic transmission builds.
Important: The Innovative Mounts 90651 is specifically designed for automatic-transmission Acura RSX applications. It is not compatible with manual-transmission RSX models and is not an engine swap conversion kit.
Features
2002–2006 Acura RSX Compatibility: Designed specifically for the DC5 chassis equipped with an automatic transmission.
Automatic Transmission Design: Engineered for the factory Acura RSX Base automatic drivetrain mounting configuration.
Honda K-Series Engine Compatibility: Designed for compatible factory K20 engine applications.
Direct-Replacement Mount Kit: Replaces the original engine and transmission mounting components.
Three-Mount Configuration: Includes driver-side, passenger-side, and rear mounting positions.
Passenger-Side Post Mount Included: Includes the appropriate engine-side mounting post.
Durable Steel Construction: Strong mounting assemblies engineered for performance applications.
Protective Powder-Coated Finish: Helps protect the steel mounting components against corrosion.
Performance Polyurethane Bushings: Provide increased resistance to drivetrain movement compared with conventional rubber mounts.
No-Tear Bushing Design: Engineered to minimize 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 loads.
Improved Drivetrain Stability: Helps control unwanted engine rocking during acceleration and deceleration.
Reduced Mount Deflection: Maintains more consistent engine and transmission 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.
Optional Front Engine Mount: Innovative Mounts 90641 is available separately for a complete four-position mounting upgrade.
Lifetime Warranty: Backed by Innovative Mounts' lifetime warranty, subject to manufacturer terms.
Popular Performance Applications
Acura RSX Base Automatic Performance Builds
Provides upgraded engine and transmission mounting for automatic-transmission RSX Base models equipped with Honda K-Series engines.
Daily-Driven Acura RSX Upgrades
Replaces aging factory mounts with a performance-oriented polyurethane mounting system.
Naturally Aspirated K20A3 Builds
Suitable for compatible K20A3 engines equipped with upgraded intake systems, exhaust components, and supporting performance modifications.
Modified Automatic K-Series Applications
Helps control excessive drivetrain movement in properly configured performance builds.
Street Performance Builds
The 75A bushing option provides increased drivetrain rigidity while retaining some vibration isolation for daily-driven applications.
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-filled engine mounts have deteriorated, cracked, or begun allowing excessive drivetrain movement.
Additional Information
- Manufacturer: Innovative Mounts
- Part Number: 90651
- Product Type: Steel Replacement Engine Mount Kit
- Vehicle Application: 2002–2006 Acura RSX Base
- Chassis Compatibility: DC5
- Engine Compatibility: Honda K20A3 / Compatible Factory K-Series Configuration
- 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
- Mounting Configuration: Three-Mount Replacement System
- Driver-Side Mount: Innovative Mounts 90611
- Passenger-Side Mount: Innovative Mounts 90620
- Passenger-Side Post Mount: Innovative Mounts B90621
- Rear Engine Mount: Innovative Mounts 90630
- Optional Front Engine Mount: Innovative Mounts 90641
- Manual Transmission Kit Alternative: Innovative Mounts 90650
- Engineering: CAD/CAM Designed and Stress Analyzed
- Installation Type: Direct Replacement
- Hood Modifications: Not Required
- Manufacturer-Listed Weight: Approximately 12 lbs
- Warranty: Manufacturer Lifetime Warranty, Subject to Terms
Available Polyurethane Bushing Hardness Options
75A – Black – Street / Performance
The softest available bushing option for the 90651.
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 90650 vs. 90651
Innovative Mounts 90650: Steel replacement engine mount kit designed for compatible 2002–2006 Acura RSX and 2002–2005 Honda Civic Si/Type-R applications equipped with manual transmissions.
Innovative Mounts 90651: Steel replacement engine mount kit designed specifically for 2002–2006 Acura RSX Base applications equipped with automatic transmissions.
Although both kits provide upgraded polyurethane engine mounting, the transmission-side mounting components differ between manual and automatic configurations.
These kits are not interchangeable.
Optional Innovative Mounts 90641 Front Engine Mount
The Innovative Mounts 90651 includes the three primary engine and transmission mounting positions.
For enthusiasts looking to upgrade the remaining front engine mounting position, the Innovative Mounts 90641 Steel Front Engine Mount is available separately.
The 90641 is specifically designed for automatic-transmission Acura RSX applications and provides the same performance-oriented polyurethane mounting benefits as the rest of the 90651 kit.
Common Reasons for Replacement
Cracked Factory Rubber: Aging rubber can deteriorate and allow excessive engine movement.
Leaking Factory Mounts: Fluid-filled factory mounts can lose their damping effectiveness when damaged.
Separated Mount Bushings: Worn factory mounts may develop excessive movement under load.
Excessive Engine Rocking: Firmer polyurethane helps control unwanted drivetrain movement.
Clunking During Acceleration: Worn mounts 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.
Complete Mount Replacement: Replaces the three primary mounting positions together rather than upgrading only one mount.
Installation Notes
Verify Vehicle Compatibility: Confirm that the vehicle is a 2002–2006 Acura RSX Base equipped with an automatic transmission.
Confirm Transmission Type: Verify that the vehicle retains the compatible factory-style automatic transmission. This kit is not intended for manual transmission applications.
Inspect the Existing Mounts: Check the factory engine and transmission mounts for cracked rubber, fluid leakage, separation, corrosion, or excessive movement.
Support the Drivetrain: Properly support the engine and transmission before removing the factory mounting components.
Remove the Factory Mounts: Follow the applicable Acura RSX factory service procedures.
Inspect Mounting Locations: Check the chassis, subframe, and mounting brackets for damage or corrosion.
Install the Driver-Side Mount: Position the Innovative Mounts 90611 automatic-transmission mount in the factory driver-side mounting location.
Install the Passenger-Side Mount: Position the Innovative Mounts 90620 passenger-side engine mount.
Install the Passenger-Side Post Mount: Install the supplied B90621 engine-side post mount according to the manufacturer's instructions.
Install the Rear Engine Mount: Position the Innovative Mounts 90630 rear mount in the factory rear mounting location.
Verify Mount Alignment: Ensure all mounts and brackets are properly aligned without excessive preload or binding.
Install the Required Hardware: Reuse applicable factory hardware or replacement fasteners specified by Innovative Mounts.
Torque Mounting Fasteners: Follow the Acura factory service manual and Innovative Mounts installation instructions.
Inspect Drivetrain Clearance: Verify that the engine and transmission do not contact surrounding chassis components.
Check for Additional Vibration: Some increase in vibration is normal when upgrading from factory rubber or fluid-filled mounts to performance polyurethane.
Perform a Final Inspection: Verify proper mounting alignment and secure hardware before operating the vehicle.
Recheck After Initial Use: Inspect the 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 is strongly recommended.
What's Included
The Innovative Mounts 90651 includes:
1 × Innovative Mounts 90611 Driver-Side Automatic Transmission Mount
1 × Innovative Mounts 90620 Passenger-Side Engine Mount
1 × Innovative Mounts B90621 Passenger-Side Engine Post Mount
1 × Innovative Mounts 90630 Rear Engine Mount
Performance polyurethane bushings in the selected hardness configuration
Additional Information
This listing is for the three-position engine mount replacement kit with the required passenger-side post mount.
The following components are not included unless separately specified:
Front engine mount – Innovative Mounts 90641
Engine or transmission components
Manual transmission conversion 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 90651 Steel Replacement Engine Mount Kit, 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 90651 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 automatic RSX, or building a modified K20A3 performance vehicle, Innovative Mounts delivers a dependable direct-replacement mounting solution.
| Part Number: | 90651 |
| Brand: | Innovative Mounts |
| Position: | Mount Kit |
| Transmission: | Automatic |
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
Vehicle Fitment
| Year | Make | Model | Trim | Notes |
|---|---|---|---|---|
| 2002 | Acura | RSX | Base | Automatic |
| 2003 | Acura | RSX | Base | Automatic |
| 2004 | Acura | RSX | Base | Automatic |
| 2005 | Acura | RSX | Base | Automatic |
| 2006 | Acura | RSX | Base | Automatic |
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Jeffrey Adams | February 8th, 2021
Fitment was perfect High quality construction, very pleased with the design, definity an up grade from OEM
xxyauxxdc5 | June 25th, 2014
I didn't get a chance to buy these mounts from kseriesparts directly but I should have, seeing that the price dropped to 212!!! I bought a used set of 75as for 180 and went to innovative directly to replace my bushings and they asked which bushings I wanted. I asked for the best one (95a). Lifetime warranty for the win! I thought, why settle for less when I can get their best mounts. Shakes a lot but hey #becauseracecar. I still need to bore out one of the holes for the driver side mount as it didn't fit perfectly so I left the top bolt off. Ill fix it later. lol
Jack the soldier | April 16th, 2013
The drivers side mount needed one hole bored about 1/8 of an inch outward but was easy to fix. Bushings are black not red. Looks awesome and after the minor modification fit perfect and do what they are supposed to. The shake is noticeable especially when the car is cold but isn't uncomfortable.
Cesar Maseda | February 6th, 2013
I needed to get new Mounts because my OEM ones were wasted.
Did a lot of looking to see if the 60A was what I was looking for, or if I should go with the 75A Kit..
There were two things that mad me go with this kit.
One, the 60A's have been known to sag sooner then the 70A's will.
Two, the 60A's are for street cars that don't make more then stock HP.
And the 75A's are for street cars that make a little bit more then stock HP.
So after they were put in, started the car.. And WOW! When it starts, you can feel less flex with the engine..
Got out to a nice long road, and went for it.
There is a LOT less flex, and a LOT more power then can be felt!
The only thing is, it's going to shake you like a doll..
(Any after market mounts will do this.) The higher the number, the more shaking there will be.
But if you don't mined the shaking, it's more then worth it.
(Once you are at 2,000 RPM's you won't feel a thing.)
Once you get used to the shaking, it feels nice.
You can really feel the power of vtec!!
If your looking at adding any more HP to your car, I would get the 75A.
Even if your mounts are still good, they will go a lot faster with having more HP.
Don't for get to get the front mount as well..
spartan43 | August 5th, 2012
through forums and fellow Honda friends, ive heard the 60a hardness mounts sag over time. so i took my chances with 75a
i drive my car hard for a DD, so aftermarket mounts were an obvious choice to install.
PROS:
car accelerates, handles, beautifully. at cruising MPH, (35-75) the vibrations are not much worse than OEM
the vibrations feel pretty good at idle.
Im assuming the 75a will not sag like the 60a, or at least as much. time will tell
CONS:
car vibrates much more at idle. shifting to Neutral helps. worse with A/C
install was difficult, but with a friend and following a DIY thread on CRSX, i was able to do all 3 mounts in 7 hours.
non- car enthusiasts will probably not like the feel of the mounts.
