Real Stage 3+ power lives or dies on fuel delivery, and the APR Multi-Port Injection (MPI) System is the difference between a turbo that flows and an engine that starves. Built around four Bosch Motorsport EV14 980cc/min injectors, this system supplements the factory direct-injection fuel system with high-flow port injection, delivering the fuel volume needed to safely support Stage 3+ boost, E85, and M100 calibrations that the stock fuel system simply can't keep up with. Every component is engineered to bolt in clean: an APR-matched Bosch Jetronic-to-OEM harness, OEM-style fuel rail and rail sensor, APR fuel distribution block, and all mounting hardware are included, so the system installs onto the factory intake manifold without any custom fabrication. The MPI System is the hardware half of APR's Stage 3+ ecosystem, required alongside matching APR ECU/TCU software to unlock true Stage 3+ output. If you're already running APR Stage 3 software and looking to add the fueling capacity to go further, or building a custom Stage 3+ setup piece by piece, this is the component that makes it possible. Compatible across the EA888 Gen 3 (Audi 8V/8Y A3, S3, TT, TTS, Q3; VW Mk7/Mk7.5 Golf R, GTI, Arteon, Jetta) and EA888 Gen 4 (2022+ Mk8 Golf R, Audi S3) platforms.

Manufacturer installation notes

Please Note: This system requires matching APR Stage 3+ ECU/TCU software and is designed for use only in conjunction with a compatible APR turbocharger system upgrade. It is not a standalone fueling solution and will not function correctly without the required software calibration.

Manufacturer-listed applications

Match the engine, body, trim and installation requirements. All qualifications shown for an application apply together. Where this part requires a modified or aftermarket assembly, the vehicle listing alone does not confirm compatibility with factory equipment.

Vehicle	Configuration and qualifications
2021–2025 Audi Q3	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2015–2020 Audi A3 Quattro	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2016–2023 Audi TTS Quattro	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2017–2019 Audi A3	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2015–2020 Audi S3	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2022–2027 Audi S3	Quantity: 1
2015–2023 Audi TT Quattro	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2015–2019 Volkswagen Golf R	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2022–2027 Volkswagen Golf R	Quantity: 1
2019–2021 Volkswagen Arteon	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2022–2023 Volkswagen Arteon	Quantity: 1
2015–2021 Volkswagen GTI	Engine: 2.0L inline-4 Quantity: 1 Region: United States
2019–2023 Volkswagen Jetta	Engine: 2.0L inline-4 Quantity: 1 Region: United States