Description
Unlock the true performance potential of your 2.0L FSi turbocharged engine with the Forge Motorsport KO4 Turbo Upgrade Actuator. Engineered as a direct replacement for factory-fitted actuators on vehicles built on the MK5 Golf chassis, this precision-machined billet aluminum actuator enhances boost control, turbo response, and overall performance.
Manufactured in the UK using aerospace-grade 6026 aluminum, this actuator is both vehicle- and turbo-specific to ensure an exact fit and consistent performance. As one of the pioneers in turbo actuator development, Forge Motorsport has built a global reputation for durability and innovation, now offering one of the most extensive actuator ranges in the industry.
Whether your car is running factory boost or a custom tune, this actuator offers a selection of spring pressures and internal mechanisms (diaphragm or piston) tailored to meet your specific tuning goals. Diaphragm-sealed internals come as standard, but Forge’s unique piston-sealed internals can be specified for enhanced durability and reduced maintenance. Both options deliver equivalent performance with outstanding reliability.
Each unit is hand-polished and assembled in the UK to exacting standards and includes Nomex-reinforced flurosilicone diaphragms, laser-cut stainless steel brackets (where applicable), and comprehensive tuning and servicing support.
Key Features:
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Designed for Audi, VW, SEAT, and Skoda 2.0L FSi turbocharged models using the KO4 turbocharger
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Choice of spring pressures to suit stock or tuned applications
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Precision CNC-machined from aerospace-grade 6026 aluminum
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Turbo- and vehicle-specific fitment for optimal compatibility
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Available with either diaphragm or piston sealed internals
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Built to order with hand-polished finish in the UK
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Nomex-reinforced flurosilicone diaphragms for heat and pressure resilience
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Stainless steel mounting brackets where required
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Lifetime manufacturer warranty*
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Includes: 1 x FMACVAG06 actuator, 1 x Forge Motorsport decal
Important Notes:
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Spring pressure ratings represent minimum regulated pressures.
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If you are unsure which configuration suits your vehicle, please contact us directly.
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This actuator is supplied with a stock spring. Higher-pressure springs are available upon request or via the FMPACTUN Spring Tuning Kit (Diaphragm Type 2, 049).
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While this actuator allows increased boost control, its effectiveness is contingent on the capabilities of your vehicle’s engine management system (EMS), whether OEM or aftermarket.
Compatibility Includes (but not limited to):
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Audi S3 2.0 FSiT (8P Chassis)
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Volkswagen Golf MK5 GTI ED30 / MK6 R / Scirocco R
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SEAT Leon Mk2 2.0 FSiT (2005–2012)
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Skoda Octavia Mk2 2.0 FSiT / VRS (2004–2012)
