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okok,
after testing
it is only useful for NA, old, significant boosting at around 2000-2500rpm
no significant fuel can be saved.
逢星期日...糕-糕-糕.

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For new car not much use.

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when it is new cost 2500? too expensive...

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有少少.
逢星期日...糕-糕-糕.

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