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The power dropping off in the top end is due to the limitations of the FA20dit's stock turbo sizing which was selected for a nice low end response. That trait is inherit of most factory turbocharged production cars.
If you try to overbore the FA20 to a 2.4l capacity you will inevitably punch through the cylinder wall unless you were to sleeve it. The fa24 block has thicker sidewalls.
A few companies make higher capacity engines. TODA, HKS, and MonsterSport all make increased capacity parts and complete engines. Few have went this route as the cost to play is extremely high for the small rewards. Also remember once the stroke gets longer the rpms go down.
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//2013 World Rally Blue BRZ Limited FBM Turbo--gone
//2018 Crystal White Pearl BRZ Ts 2.2l Harrop Supercharged
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