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The GFB WGA wastegate actuator is a bolt‑on internal actuator intended for 1999–2021 Subaru WRX and STI models. It uses a large silicone/Nomex diaphragm and offers an 18mm rod stroke plus a pivoting PEEK rod guide to reduce profile and friction. The WGA provides turnbuckle adjustment and three stainless springs covering roughly 5–22psi base pressure, enabling quicker spool, more stable boost and higher peak boost support when tuned.
GFB 99-21 Subaru WRX STI WGA Wastegate Actuator (Tune Required)
