Just to be safe u might want to have ur compression tested. Tuning cars on dyno can be abuse to engine.

What's safe partially depends on condition of ur engine, ur tuners ability and how u drive it. Boost ur car from cold start can kill any betty's engine, just saying. Imo, 21psi can still be safe if u have enough mechanical sympathy.

Mine made 240whp with stock map. Evor's dyno reads pretty low btw.

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