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Sport-Tuned Drop Springs Calibrated for the 2024 Subaru WRX TR Platform
The RS-R RSRF407D Down Sus springs are engineered specifically for the 2024 Subaru WRX TR (VBA chassis), accounting for the TR trim's unique suspension tuning and spring specification that differs from standard WRX trims. The RSRF407D delivers an approximate front drop of 15mm to 20mm and a rear drop of 25mm to 30mm, lowering the WRX TR's stance while improving cornering body roll control without the harshness of race-spec springs. Spring rates of 3.55 kg/mm front and 4.28 kg/mm rear are matched to the TR's factory geometry for predictable, balanced handling on both street and track days.
Key Features
- Approximate drop: Front 15mm to 20mm (0.6 in. to 0.8 in.), Rear 25mm to 30mm (1.0 in. to 1.2 in.)
- Spring rates: Front 3.55 kg/mm, Rear 4.28 kg/mm, tuned for the 2024 WRX TR (VBA) suspension geometry
- Progressive winding reduces body roll and improves cornering response while maintaining street comfort
- Drop-in replacement for OE springs, compatible with factory struts and shocks
- RS-R proprietary high-tensile steel with anti-corrosion coating
- 3-year, 36,000-mile limited warranty
- Sold as a set of 4 springs
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2024 | Subaru | WRX | TR |
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | RSRF407D / F407D |
| Brand | RS-R |
| Application | 2024 Subaru WRX TR (VBA) |
| Front Drop | Approx. 15mm to 20mm (0.6 in. to 0.8 in.) |
| Rear Drop | Approx. 25mm to 30mm (1.0 in. to 1.2 in.) |
| Front Spring Rate | 3.55 kg/mm |
| Rear Spring Rate | 4.28 kg/mm |
| Set Quantity | Set of 4 (2 front, 2 rear) |
| Warranty | 3 Years / 36,000 Miles |
| UPC | Contact vendor for UPC |
What's Included
- 2x RSRF407D front lowering springs
- 2x RSRF407D rear lowering springs
About RS-R
RS-R is a Japanese suspension manufacturer with decades of development experience on the JDM and global aftermarket. Known for their precise spring engineering and extensive OEM-equivalent testing protocols, RS-R products are widely used across street, track, and time-attack applications throughout Japan, Australia, and North America. All RS-R springs sold in the US market are covered by RS-R USA's warranty program and are supported by North American distribution.
Frequently Asked Questions
What is the drop for the RSRF407D on the 2024 Subaru WRX TR?The RSRF407D provides an approximate front drop of 15mm to 20mm (0.6 in. to 0.8 in.) and a rear drop of 25mm to 30mm (1.0 in. to 1.2 in.) on the 2024 Subaru WRX TR (VBA). Drop measurements are averages taken on a stock vehicle with OE shocks in good condition. Individual results may vary based on vehicle load and component wear.
Why is the RSRF407D different from the F405D used on other WRX trims?The 2024 WRX TR uses a unique factory spring specification compared to the standard, Premium, Limited, and GT trims. The TR's stiffer OE spring rates and suspension geometry required RS-R to develop a separate spring set calibrated specifically for that configuration. Using the F405D on a TR, or the RSRF407D on a non-TR WRX, would result in incorrect spring geometry and potentially different ride height outcomes than specified.
Do the RSRF407D springs require new struts or shock absorbers?No. The RS-R RSRF407D is engineered as a direct OE spring replacement, compatible with the factory strut and shock assemblies on the 2024 WRX TR. For track or autocross use, pairing with performance dampers will further improve handling, but it is not required for street installation.
Is the RSRF407D compatible with the 2024 WRX STI?No. The 2024 model year Subaru WRX STI is a separate chassis and uses a different suspension configuration. The RSRF407D is calibrated specifically for the 2024 WRX TR (VBA). The WRX STI has its own RS-R spring application.
Will the RSRF407D affect the 2024 WRX TR's AWD system or handling electronics?The RSRF407D replaces only the passive coil springs and does not interact with the WRX TR's symmetrical AWD system, SI-Drive, or stability control electronics. Lowering the vehicle will shift the suspension geometry slightly, which is addressed by a post-installation alignment. Electronics will function normally after installation.
Does the RSRF407D require a wheel alignment after installation?Yes. A professional four-wheel alignment is required after installing the RSRF407D to correct camber and toe settings for the new ride height. Skipping the alignment will result in uneven tire wear, compromised handling, and potential steering pull. Schedule the alignment immediately after installation.
Will the RSRF407D lower my 2024 WRX TR enough to close the fender gap?The 15mm to 20mm front and 25mm to 30mm rear drop of the RSRF407D provides a subtle stance improvement that reduces the stock fender gap without being aggressive enough to cause fitment issues with OE or modestly wider aftermarket wheels. For a more aggressive stance, RS-R's SuperDown or Ti2000 series would provide greater drop on compatible WRX applications.
What warranty does RS-R provide on the RSRF407D?RS-R USA backs the RSRF407D with a 3-year or 36,000-mile limited warranty from the date of purchase, whichever comes first. The warranty applies to the original purchaser and covers manufacturing defects. It does not cover damage from misuse, improper installation, or track/competition use.
Installation Instructions
- Lift and support the 2024 WRX TR safely on jack stands with all four wheels off the ground.
- Remove all four wheels to gain access to the front strut assemblies and rear suspension.
- Compress the front OE coil spring using an approved spring compressor before loosening the strut top mount nut.
- Remove the OE front spring and replace it with the RSRF407D front spring, confirming correct seating at both the upper mount and lower perch.
- Reassemble the strut and reinstall into the vehicle. Torque all mounting hardware to factory specification.
- Repeat on the opposite front.
- Support the rear suspension at the lower control arm and remove the OE rear coil spring.
- Install the RSRF407D rear spring, ensuring proper seating on the lower perch and upper isolator.
- Repeat on the opposite rear.
- Reinstall all wheels and torque lug nuts to specification.
- Lower the vehicle and bounce each corner to settle the springs before alignment.
- Perform a professional four-wheel alignment before returning the vehicle to regular driving.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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