Experimental results show that the position of the converter nearer to the exhaust port, the retard ignition timing and the higher idle speed can promote the catalytic converter light-off.

试验结果表明，催化转化器的位置距排气口近可提高排气温度，大大提高催化转化器的转化效率；推迟点火提前角和提高怠速转速均有利于使催化转化器进入快速起燃状态。

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The bass reflex port is optimally positioned to ensure the twin woofers drive accurately and with synchronous timing, controlling back radiation and to help eliminate sound distortion.

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