My butler down pipe's cat was blown loose, had it replaced after only 70000km. Invidia seems to be very good, so does xforce.

Maybe do a compression test before push it with a tune.

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