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The GFB WGA internal wastegate actuator for Mitsubishi Evo 4–8 replaces the factory actuator with a larger diaphragm and long 18mm rod travel for finer boost control. Its Silicone/Nomex diaphragm and PEEK-machined pivoting rod guide reduce size while increasing control authority. Supplied with three stainless springs adjustable across a 5–22 psi base range and turnbuckle adjustment for quick fine-tuning without spring swaps.
GFB Mitsubishi EVO4-8 Internal Wastegate Actuator
