The change of the Ratio A/R to make the exhaust speed or slow vary according to the size of the isthmus. If the A/R Ratio is too high, the large turbocharger boost isthmus is slow, but the heat accumulated in the cooling of the Turbo, the exhaust back pressure shall not be more. If the A/R Ratio is too low, there will be a quick boost, but if the heat accumulated in the Turbo pressure and high exhaust system back in the lot. Although there will be a response, but the engine is in the high.
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