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As tracer mentioned, less movement of the throttle body is needed to get the same amount of air into the engine, note that opening the throttle is not a linear amount of increased airflow, having a throttle 50% open is actually letting the majority of the air it can flow through. This is one advantage to an electronic throttle body as 50% input can actually be programmed to be 50% output, or be less sensitive at the lower range pedal travel making a high HP car (or even an oversized throttle body or perhaps ITBs) more streetable.

Generally speaking a throttle body never results in more power, however if it is causing a restriction in the airflow then a bigger throttle body can help. What makes people think it gives more power is that a bigger throttle body opening at 10% might be like opening the stock one 20% open. Effectively this would be like having a heavier foot, but at WOT the bigger throttle body might flow the same amount of air as the stock throttle body (or even less if it causes the velocity of the air to be slowed).

I'm fairly certain 55mm 48mm is plenty for this engine without it being heavily modified, probably even with a ported head and intake.
 

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If you experiment with the IMRC opening rpm, you can also find that sweet spot between long-runner (low-rpm) and short-runner (high-rpm) transition.
Typically for short runner/long runner transitions you simply run each on the dyno and right where the power bands crossover that's when you switch. This could just as easily be done with virtual dyno, no dyno rental required.
 
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