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One of the most frequently asked questions when it comes to mid 2000s Caterpillar engines; Single turbo or “Twin” turbo.While the factory Acert turbochargers are often referred to as “Twins” they are NOT twin turbos. Twin means the same and the two turbos on Acert engines could not be any more different from one another.  Take a look for yourself..The Acert uses a high pressure (primary) turbo and low pressure (atmospheric) turbo. Contrary to popular belief, the high pressure turbo is act …