There r at least three crutial variables relating to engine tuning: boost timing and fuel. Boost level ia only one aspect.

Get to a proper workshop for a tune is my advice.

And get a wideband afr gauge.

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