I'm considering a Nismo, so I'm NOT anti Nismo
As far as the tune, the H.P. gain is at the engine, not at the wheels. I THINK a Osires uprev tune can add more H.P. than that factory one. When mods like test pipes or exhaust or just about any mod is added, the Osires tune woulds make even more sense. With a custom tune you can also have your redline raised.
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