Replace all fluid if u can, check timing belt and spark plug if possible. U never know how previous owner treated the car.

Agree on sway bar, maybe lower spring (not king spring imo). Get good tyre when current one wears out. Maybe tbe and tune later, if nothing wrong with the car

using the Perth-WRX mobile app

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport