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Ultra Racing 4-Point Mid Lower Brace Subaru Impreza WRX STI GR / XV – UR-MS4-1336P
Improve chassis rigidity and suspension response with the Ultra Racing UR-MS4-1336P 4-Point Mid Lower Brace, designed for compatible Subaru Impreza WRX STI GR and Subaru XV applications.
Mounted underneath the vehicle using existing chassis mounting locations, this rigid steel reinforcement helps reduce unwanted chassis flex during hard cornering, braking and rapid direction changes. By creating a more stable platform for the suspension, it can contribute to sharper steering response and more predictable handling.
Constructed using Ultra Racing’s welded steel design and finished in the brand’s distinctive white powder coat, the UR-MS4-1336P is particularly suited to fast-road, track-day and modified Subaru builds running performance tyres, lowering springs or coilovers.
SKU / MPN: UR-MS4-1336P
£155.53
1 in stock
Delivery & Return
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Vehicle Fitment & Compatibility
It is the customer’s responsibility to check that a product is suitable for their vehicle before installation.
Please verify the vehicle model, year, engine, chassis code, part number and any relevant brake, suspension or drivetrain specification before ordering.
If you are unsure about compatibility, contact us before purchase with your vehicle registration or VIN and the product SKU where possible.
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2 - DAY DELIVERY
Sep 06 Sep 10
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Description
Additional information
Ultra Racing Mid Lower Brace for Subaru Impreza WRX STI & XV
The Ultra Racing UR-MS4-1336P Mid Lower Brace is a vehicle-specific chassis reinforcement upgrade designed to strengthen the centre/lower section of compatible Subaru platforms.
Ultra Racing officially categorises UR-MS4-1336P as a Middle Lower Side Bar / Middle Side Member Brace, while its international application catalogue describes the product as a 4-point middle lower brace.
Unlike a suspension spring, damper or anti-roll bar, a chassis brace does not directly alter spring rates or ride height. Instead, it reinforces structural mounting areas of the vehicle so the suspension operates from a more rigid platform.
Reduce Unwanted Chassis Movement
A vehicle body is subjected to considerable twisting forces during enthusiastic driving. These loads increase further when fitting:
- Performance tyres
- Coilovers
- Lowering springs
- Uprated anti-roll bars
- Performance brakes
- Higher engine output
By connecting multiple chassis mounting points, the UR-MS4-1336P helps reduce relative movement through the central lower section of the car.
Ultra Racing states its lower-side braces are intended to reduce chassis flex around suspension-related mounting areas, helping maintain more consistent geometry under load.
4-Point Reinforcement
The MS4 designation represents a four-point middle/lower brace configuration.
The brace is designed specifically around compatible Subaru chassis mounting locations rather than being a universal-fit component.
Ultra Racing’s GR catalogue confirms UR-MS4-1336P for the Subaru WRX STI Hatch GR, while Ultra Racing Malaysia additionally categorises the same part for Impreza WRX STI / XV applications.
Potential Performance Benefits
When installed correctly as part of a properly maintained suspension setup, this brace can contribute to:
- Reduced lower chassis flex
- Improved chassis rigidity
- More consistent suspension response
- Sharper steering feedback
- Greater confidence during fast direction changes
- More predictable handling under heavy cornering loads
- Improved structural support for modified suspension setups
It is important to understand that a chassis brace does not create additional engine power or tyre grip. Its role is to help the existing suspension and chassis work more consistently.
Ideal for Modified Subaru Builds
The UR-MS4-1336P is particularly suitable for Subaru owners running:
Fast-road setups
Useful for drivers wanting greater chassis response without making major suspension changes.
Coilovers or lowering springs
Stiffer suspension components can place greater loads through the chassis.
High-performance tyres
Increased tyre grip transfers greater forces into suspension mounting points and the vehicle shell.
Track-day setups
Additional structural reinforcement can help maintain consistent chassis behaviour during repeated high-load cornering.
One-Piece Welded Steel Construction
Ultra Racing specifies the UR-MS4-1336P as manufactured from one-piece welded steel construction without bolted joints, finished in the company’s characteristic white powder coating.
This design is intended to provide a rigid connection between its mounting points.
Bolt-On Installation
Ultra Racing describes UR-MS4-1336P as a bolt-on component using OEM mounting locations, requiring no cutting or welding under normal installation conditions.
Professional installation is nevertheless recommended, particularly on older or modified cars.
Before fitting, check clearance around:
- Aftermarket exhaust systems
- Exhaust centre sections
- Undertrays
- Custom underbody components
- Previously installed chassis braces
- Modified suspension or subframes
Cars that have suffered accident damage or substantial chassis distortion should have mounting alignment checked before installation.
Key Features
- Genuine Ultra Racing chassis reinforcement
- 4-point middle/lower brace
- Manufacturer part number UR-MS4-1336P
- Vehicle-specific Subaru application
- One-piece welded steel construction
- White powder-coated finish
- Helps reduce unwanted chassis flex
- Supports more consistent suspension operation
- Can improve steering and chassis feedback
- Excellent supporting modification for coilovers
- Suitable for fast-road and track-day builds
- Bolt-on installation at applicable mounting points
- No universal drilling pattern
- Designed for compatible Subaru Impreza WRX STI / XV applications
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Ultra Racing |
| Product | Middle Lower Side Brace |
| SKU | UR-MS4-1336P |
| MPN | UR-MS4-1336P |
| Brace Configuration | 4-Point |
| Position | Middle / Lower chassis |
| Construction | One-piece welded steel |
| Finish | White powder coat |
| Fitment | Vehicle-specific |
| Installation | Bolt-on |
| Cutting/Welding | Normally not required |
| Primary application | Subaru Impreza WRX STI GR / Subaru XV |
| Performance use | Fast road / track / modified vehicles |
Ultra Racing’s current product page specifically lists one-piece welded steel construction, white powder coating and bolt-on installation.
Vehicle Fitment / Compatibility
Subaru Impreza WRX STI
The strongest specific application evidence identifies:
Subaru WRX STI Hatch – GR generation
Ultra Racing’s application catalogue lists MS4-1336P Mid Side Bars against its 2007–2014 Subaru Impreza WRX STI GRB hatchback application.
For UK cars, the relevant WRX STI Type UK hatchback uses the 2.5-litre turbo EJ257.
Subaru XV
Ultra Racing Malaysia also officially lists UR-MS4-1336P under:
Subaru Impreza WRX STI / XV – Middle Lower Side Bar / Middle Side Member Brace.
Supporting catalogues identify the first-generation XV/Crosstrek, approximately 2012–2017, as an application.
Important UK fitment caution
I would not automatically populate every UK Subaru XV engine variant from this evidence.
While the manufacturer identifies the XV platform, the available primary catalogue information does not clearly distinguish between UK:
- 2.0 petrol FB20
- 2.0 diesel EE20
Therefore, the safest WooCommerce approach is to either:
list the XV platform with “engine confirmation required”, or confirm the VIN/application with Ultra Racing before assigning the brace to individual UK petrol and diesel derivatives.
I would also not automatically list GV saloon STI models for this SKU. Unlike UR-SD8-1337P, the strongest model-specific source for MS4-1336P explicitly identifies the GR hatch.
FAQ
What does the Ultra Racing UR-MS4-1336P fit?
Ultra Racing identifies UR-MS4-1336P for compatible Subaru Impreza WRX STI and Subaru XV applications. Its GR-specific catalogue confirms the middle brace for the third-generation WRX STI hatchback.
Is UR-MS4-1336P a 4-point brace?
Yes. The product is specified as a 4-point middle lower chassis brace.
What does a mid lower chassis brace do?
It reinforces mounting points underneath the centre section of the vehicle to reduce unwanted chassis movement under cornering, braking and acceleration.
Will it improve the handling of my Subaru WRX STI?
The brace does not increase tyre grip directly, but greater structural rigidity can provide a more stable platform for the suspension and contribute to more consistent steering and handling response.
Is it suitable for a Subaru running coilovers?
Yes. Chassis reinforcement is particularly useful on vehicles fitted with stiffer suspension, performance tyres and other handling modifications.
Does UR-MS4-1336P need welding?
Ultra Racing specifies the part as a bolt-on brace designed around OEM mounting locations, with no cutting or welding normally required.
Is the brace made from aluminium?
No. Ultra Racing specifies this particular product as one-piece welded steel with a white powder-coated finish.
Does it fit every Subaru XV?
Do not assume that it does. Ultra Racing lists XV compatibility, but the public manufacturer information I found does not sufficiently differentiate every UK petrol and diesel derivative. Check the registration/VIN before ordering if exact compatibility is uncertain.
| Weight | 3000 lbs |
|---|
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