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Message: [QUOTE="gnxtc2, post: 1211036, member: 1414"] Boost is restriction. If the engine is able to use all the cfm provided by the turbo, there would be 0 boost. The bigger and more efficient turbos give more cfm at lower boost levels. The stock turbo needs to be worked harder to provide the same cfm. When this happens, the turbo is being operated out its map. There is a balance between compressor wheel size/design vs exhaust wheel/exhaust housing A/R. The more cfm you put in the more, the same air needs to exit....exhaust backpressure/drive pressure. Once the drive pressure reaches 2:1 to boost, need to look at a different turbo, cam lobes and/or exhaust housing to lower the drive pressure. Billy T. [email]gnxtc2@aol.com[/email] [/QUOTE]

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