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Forge K04-02x Diaphragm Actuator (yellow spring ~15psi)

Forge K04-02x Diaphragm Actuator (yellow spring ~15psi)

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Adjustable Actuator for Seat/Audi VAG K04 Transverse 1.8T Engines - Comes with yellow "15psi" Spring, diaphragm type.

Forge Motorsport were one of the first company’s in the world to design and manufacture the billet two-piece replacement aluminium turbo actuator. Originally for the Cosworth, Renault 5 GT turbo, and Lancia Integral turbos, they soon developed the largest and most diverse range of actuator replacements.


  • Choice of spring pressures to suit your car
  • Manufactured from 6026 grade aluminium
  • Vehicle specific
  • Turbo specific
  • Built to order
  • Machined and hand polished in the UK
  • Choice of piston or diaphragm operation on most actuators
  • Nomex reinforced flurosilicone diaphragms
  • Laser cut stainless steel brackets (where applicable)
  • Tuning and service kits available
  • Made in England
  • Lifetime warranty*