With 2k, u might just get norm butler exaust, very quiet at idle, starts shouting after 3k rpm. They r made to fit.

Otherwise, u can get x force for about 1k. I dont think warranty worth anything(?). Have seen 2012 sti making 343 whp with x force without much restrictions.

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