Invidia is also very good, welding is spot on, and they use thicker flanges than my Norm downpipe (thin flange would bent under high temp and cause leak), and the big inlet will reduce wastegate pressure at high rpm.

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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