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Old 08-30-2007, 09:46 AM
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Join Date: Apr 2005
Posts: 136
603 turbo boost question

Hi guys,

I'm a turbo newb but I'm curious. How much boost can a 603 turbo create?


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Old 08-30-2007, 02:30 PM
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Join Date: Aug 2001
Location: USA
Posts: 8,069
In stock tune, I've never seen one go past 17-18psi. The peak boost is irrelevant, since the engine is cabale of a significant power increase even at stock boost levels. And beyond that, the exhaust backpressure from the restrictive manifold is much more of an issue that boost level.

Boise, ID

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