Try killer b extreme header with butler tbe. That should be the best u can get.

U might want ebc, fuel pump and cai too. U can go a bit further with turbo and injectors. That how japenese tuner do.

Imo, I think oil pressure gauge and aos are must have for any moded cars. It wont help u goes faster though

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