WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The APR Rear Roll-Control Sway Bar (SUS00031) is specifically engineered for high-output AWD MQB Evo vehicles equipped with advanced rear differentials, such as the Mk8 Golf R and 8Y RS3 (Torque Splitter models). By increasing the bar diameter to 25mm with a 5mm wall thickness, APR provides a 72% increase in spring rate over the factory setup on the stiffest setting. This upgrade is essential for neutralizing the inherent understeer often found in AWD platforms, allowing the rear of the vehicle to rotate more predictably and reducing body roll for flatter, more stable cornering.
Constructed from high-tensile hollow steel, each bar is CNC-bent from a single piece of stock to eliminate welds and potential failure points. The ends are forge-pressed and quench-hardened for maximum durability under extreme lateral loads. Paired with greaseable polyurethane bushings and finished in a corrosion-resistant red powder coat, this bar offers two-way adjustability, allowing drivers to fine-tune the chassis balance to match their driving style or track conditions.
Key Features:
- Optimized AWD Balance: Designed specifically for vehicles with rear torque-splitting differentials to reduce understeer and improve turn-in.
- Significant Stiffness Gain: Provides a spring rate of up to 672 lbs/in—a 72% increase over the factory 8Y RS3 / Mk8 Golf R rear bar.
- Two-Way Adjustability: Features multiple mounting points to switch between "Soft" (583 lbs/in) and "Stiff" (672 lbs/in) settings.
- High-Tensile Hollow Steel: 25mm diameter design provides professional-grade stiffness while remaining lightweight.
- Superior Construction: CNC-bent from a single bar with no welds; forge-pressed and quench-hardened ends for maximum strength.
- Polyurethane Bushings: Includes upgraded bushings to eliminate the deflection and delay associated with factory rubber mounts.
- Direct Fitment: Designed as a direct, plug-and-play replacement for the factory rear stabilizer bar.
Technical Specifications:
| Specification | APR Roll-Control | OEM (Mk8 R / 8Y RS3) |
|---|---|---|
| Diameter | 25 mm | 22.2 mm |
| Wall Thickness | 5.0 mm | 4.3 mm |
| Spring Rate (Soft / Stiff) | 583 / 672 lbs/in | 390 lbs/in |
| Max Rate Increase | +72% | Baseline |
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