First thing first, welcome!

Im no expert advice on spark plug, but I think its normal?

Not very often to c AVO turbo. 450 should have heaps more potential. Enjoy.

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