In total a big fat 0, But what you will gain is Zero loss of power as you will no longer heat soak on hot days or if you hammer it around and heat soak the engine.
But fitting an FMIC will allow a tuner to push the level of tune of a custom remap a bit further, safe in the knowledge that lower IAT's mean less knock/pinging.
Not something i'd consider unless I lived in a hot country or was about to get a remap anyway.
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