Like air filters, aftermarket air intakes have been proven to be able to improve performance, but having them installed correctly is crucial in order to extract maximum performance gains.

像空气过滤器、售后进气孔之后都已经被证明能够提高性能，但在正确安装是至关重要的，他们以谋取最大的性能收益。

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But that is one of the many claims against Mr Ashcroft that has not been proven: Michael Ancram, the party chairman, credits him with having broadened the party's financial base.

ECONOMIST: Living on his wits | The