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compression ratio?

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Your best bet for boost is to stay around 8.0-9.0. My dsm mechanic is running 8.5-1 is his new setup, its not finished yet.
 
There are so many variables as DSM-onster stated. You have to equate what octane fuel you'll be using, will you be using meth. injection?, fuel, engine management, ect... Its too opened-ed of a question for us to awnser, you need to figure out what set-up you will be going with, and what you want out of it.
 
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