Already running APR's Stage 1 AWD Controller Software for Gen 5 Haldex and wondering what's next? The Stage 1 to Stage 2 Software Upgrade is designed specifically for drivers ready to extract the full potential of their AWD system without compromising the refinement and reliability they already trust. ADDITIONAL CONSIDERATIONS: Proper maintenance and usage are critical to ensure long-term performance and reliability of the Haldex AWD system. Always maintain proper manufacturer service intervals (or more frequently under performance use). HALDEX SYSTEM CONSIDERATIONS: The Haldex AWD system plays a critical role in launch consistency and torque distribution. Allow for a cool-down period between launches to prevent overheating and maintain consistent engagement. Repeated launches without cooldown may reduce AWD effectiveness and increase component wear. REQUIRED UPGRADES & SOFTWARE PAIRING: To ensure proper drivetrain performance, consistency, and durability, the following calibrated software combinations are required. These components are designed to work together as a complete system: Audi RS3 Required: APR ECU + APR TCU + APR AWD Software (all w. Haldex designation) | VW Golf R Required: APR TCU + APR AWD Software (all w. Haldex designation) Mk7 Golf R Results (93): ·         60 FT Improvement Over Stock - Stage 1: 0.14s | Stage 2: 0.20s ·         0-60 MPH Improvement Over Stock - Stage 1: 0.34s | Stage 2: 0.46s ·         0-100 MPH Improvement Over Stock - Stage 1: 0.14s | Stage 2: 0.34s ·         1/4 Mile Improvement Over Stock - Stage 1: 0.18s | Stage 2: 0.30s Audi RS3 8V Results (E85) ·         60 FT Improvement Over Stock - Stage 1: 0.06s | Stage 2: 0.21s ·         0-60 MPH Improvement Over Stock - Stage 1: 0.23s | Stage 2: 0.53s ·         0-100 MPH Improvement Over Stock - Stage 1: 0.27s | Stage 2: 0.56s ·         1/4 Mile Improvement Over Stock - Stage 1: 0.27s | Stage 2: 0.47s *Reported results may vary RECOMMENDED TIRES & PRESSURES: The following tire setups were used to achieve APR's published performance figures. For similar results, we recommend Michelin Pilot Sport 4S tires in the following sizes. Audi RS3: Front: 265/30R19 | 30 PSI & Rear: 245/35R19 @ 32 PSI & Volkswagen Golf R: Front: 235/35R19 @ 38 PSI | Rear: 235/35R19 @ 38 PSI FUEL LEVEL RECOMMENDATIONS: Maintaining proper fuel levels is critical for consistent performance due to increased fuel slosh under high-load conditions. During our testing the Golf R on pump gas required no less than 3/4 tank for maximum acceleration. The RS3 on E85 required a minimum of 100 miles remaining fuel range.