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Discussion Starter · #1 ·
i have a 2000 s40 (phase 1).... one of the 1.9t engines<br>the written specs say that it has a 9:1 compression and something like 8.5psi and that's cool but im looking from a performance standpoint...with the engine internals- is it safe to raise the boost level at all- in the 2-4 psi range.<p>
 
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