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      04-07-2007, 10:36 PM   #3
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Drives: 2007 335i
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The bi is if you want to make a lot of power. A small turbo, then a larger turbo for a lot of boost. BMW uses a bi-turbo in the 335 diesel. The diesel needs tons of boost (26psi) to make decent power verus only 8.5psi of boost for the 335i petrol.
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