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It depends of what you want to achieve. If you have an AT car, it makes sense because the transmission is coming from Lexus and the gears are unreasonable long for a sports car. It is clear that this transmission was focused mainly for a highway cruiser. If you have an MT car it will give more advantage in low speeds, but it doesn't mean you will be faster in all scenarios. In other cases you'll be slower. Just to give you an example. I am following the track build of Japan's fastest NA car. They are doing this for decades and they want now to get back the track record on street tires. In a particular straight the gearing is too short and they hit the rev limiter. They have to shift to higher gear which loses time. This is happening on a S2k car. They consider now to switch the final drive from 4.3 to 4.1 or even 3.9! So, going to a 4.875 fd is not always better.
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